Installing a garbage disposal is a relatively easy task and something you can do yourself, especially if you're a DYI kind of person. We'll take you step-by-step thru the process with pictures and a video.This article primarly covers installing a garbage disposal for the first time. Although, if you are replacing your disposal, you'll also find the information you need.If you don't have an electrical outlet under your sink, or a wall switch to turn the disposal on and off, you should contact a professional electrician before starting. Installing a Garbage Disposal Now that you've purchased your new garbage disposal you're probably excited to get it installed and running. It's important to keep safety top of mind since you'll be working with water and an electrical appliance. Take your time, and if you don't feel comfortable, you should contact a professional plumber.PreparationOne thing to keep in mind is that each garbage disposal is slightly different from the next. You should always refer to your disposal's installation instructions, as it will have the most accurate information for your specific unit.Before getting started, there's a few tools and supplies you'll need to have on hand.Putty KnifeWire NutsHose ClampScrew DriverPlumbers Putty3/8" Clamp Connector Turn OFF the Electricity - Before you start, it's critical that you turn OFF the circuit breaker in your home's electrical panel. If you're replacing a garbage disposal, follow these steps, then jump to Step 3 below.Disconnect the drain trap from the discharge tube.If you have a dishwasher, disconnect the dishwasher attachment.Insert a screwdriver to the right of 1 of the 3 mounting lugs on the mounting ring.Turn the screwdriver counter clockwise (left) to release the disposal from the mounting ring. Be prepared and hold onto the disposal. Once it's released, it will fall. Remove the disposal's electrical plate and disconnect the wiring.If you are replacing the disposal with a similar model, you may be able to use the existing mounting assembly.If not, you'll need to detach the mounting assembly by removing the snap ring. Once the snap ring is removed, the entire mounting assemby will come off the sink flange.Use a screw driver to loosen the nut holding the sink flange in place.Remove the sink flange from the top. Turn OFF the Electricity - Before you start, it's critical that you turn OFF the circuit breaker in your home's electrical panel. Step 1Disconnect The Drain PipePlace a bucket under the drain pipe to catch any water that may be in the pipes.Disconnect the drain pipe. Depending on your set-up, you may need to use a pipe wrench. Step 2Remove Sink StrainerRemove the sink flange from the sink's drain hole. You should be able to pull it out easily. Although, you can use a screw driver or putty knife to pry under the edge if necessary. Step 3Remove Excess PuttyUsing your putty knife, scrap away any excess putty left of the sink opening.Use a towel to clean the sink opening and surrounding area. Step 4Putty Around FlangeGrab a handful of plumbers putty and role it between your hands until it forms a rope that is between 1/2 to 3/4 inches thick. Apply the rope of plumbers putty around the new flange.The plumbers putty needs to fully surround the flange. Add more if needed.Press the flange into place making sure that any writing on the flange is straight and facing you.As you press the flange into the sink opening, the plumbers putty will seep out from the sides. This is normal and does not need to be removed at this time. The plumbers putty will prevent the sink flange from leaking. Step 5Secure Flange from MovingPlace a towel inside the sink and on top of the flange.Set the garbage disposal on top of the towel. This will keep the flange from moving while you're working underneath. Step 6Prepare the Mounting RingStack the fiber gasket, on top of the backup flange. Then place the mounting ring (with the 3 bolts) on the bottom. It's often easiest to loosen the mounting ring bolts. Find the metal snap ring and have it within reach. Step 7Install Mounting BracketWorking under the sink, you'll likely see a small amount of plumbers putty seeping between the sink flange and the sink. This is okay and does not need to be removed. Install the fiber gasket, backup flange and mounting ring under the flange.You can install these components as a group as the video shows, or you can put them in place one piece at a time. Just make sure that they are in the correct order. The smooth side of the backup flange should be against the sink.Position one side of the snap ring over the groove on the bottom of the sink flange and pull the other side open. The ring should snap into place. Double check that the snap ring is seated correctly within the groove. Step 8Secure Into PlaceTighten the bolts evenly by alternating from one bolt to another until they are against the back-up flange.It's a good idea to check that the sink flange hasn't moved while you are tightening the bolts. Simply remove the garbage disposal from the sink and check that the writing is still facing you.The back-up flange should be tightly seated to the sink. Step 9Clean Sink DrainRemove the garbage disposal and towel from inside the sink.Use your putty knife and clean-up any excess putty from the sink flange. Step 10Remove Drain PlugOnly Do This Step If You Have A Dishwasher.Set the disposal on a firm surface, such as a counter or floor. Locate the dishwasher knock out plug. Place a screw driver in the center of the drain plug and, using a hammer, knock out the plug.Find and remove the plastic plug from the inside of your garbage disposal. Step 11Connect WiringTurn the disposal upside down and locate the wiring plate on the bottom.Remove the wire cover plate with a screw driver and gently pull the black and white wires out.You'll also see a green screw. This is the ground.Screw a 3/8" Clamp Connector into place on the bottom of the disposal. Typically there's a hole for the connector next to the wiring plate. Purchase the appropriate cord for your disposal, if a cord did not come with your unit. Or, if you prefer, you can hard wire the disposal instead of using a cord.Slide the cord into the clamp connector from the top. Be sure to leave enough room to make a connection. Use wire strippers to expose a small amount of wire.The wire that has green (often in the casing) or is bare without a casing, will go with the green screw. Twist the exposed wire and carefully wrap it around the green screw; then tighten the screw so that the wire will not slip.Match the disposal's wire colors to the electrical cord wires. White-to-white / black-to-black. Sometimes the black wire will be a different color, such as red or blue.Twist the white wires together in a clockwise direction with a pair of plyers. Then use wire nuts on the twisted wires. Twist the wire nuts clockwise until they are snug. There should not be any exposed wire. Repeat with the black wires.Gently put the wires back into the garbage disposal and replace the wire cover plate.Tighten the screws on the cord clamp connector until they are snug. Step 12Insert Discharge GasketLocate the discharge tube on the disposal. Place the gasket within the discharge outlet. Step 13Connect Discharge TubeConnect the discharge tube to the discharge outlet.Use the discharge flange and bolts to secure the tube into place. Again, evenly tighten the screws. Depending on where your sink trap is located, it may be necessary to use a hacksaw and cut the discharge tube down to size. Or use an adapter to length. It's a good practice to measure this first, before mounting the disposal. Step 14Connect the DisposalPosition the disposal into place under the sink. Align the 3 tabs on the disposal to the 3 openings on the mounting ring. Then turn until the mount is holding the disposal.Use the included wrench or a screw driver to tighten and secure the disposal in place.Now you can rotate the disposal so that the discharge tube aligns with the drain pipe. Step 15Connect Dishwasher DrainConnect the dishwasher drain to the disposal's dishwasher drain outlet.Secure the drain line with a hose clamp to prevent it from slipping off. Step 16Align the Discharge PipeCheck that the discharge pipe is properly aligned with your plumbing.Connect the disposal's discharge pipe to your sink's drain pipe.In some cases, it may be necessary to reconfigure the drain. Step 17Check for LeaksTurn the water ON in the sink. Place the stopper into the sink drain.Check for leaks at the sink flange, mounting assembly, tail pipe, and dishwasher connections. If there are no leaks, plug in the disposal.Turn ON the circuit breaker in your home's electrical box, and test your garbage disposal.Watch the Full VideoAs you can see, installing a garbage disposal isn't difficult, but you will need to work with plumbing and electricity. If you're not comfortable taking on this project, you should contact a professional plumber.