Reason's to replace a light switch:
Over time the parts inside the switch wear down or break. This wear can make the device difficult or sometimes impossible to use. Its at this point where you want to swap out the switch for a new one.
Another reason to swap out the switch is to improve its utility or aesthetic features. Light switches come in various shapes, sizes, and colors, choosing the right one is up to you.
Replacing a light switch should only take 5 to 15 minutes.
Step 1: Materials and Tools Required:
-New light switch
-New faceplate (optional)
(Optional) Replacing the faceplate is not a requirement to replace the switch, but the faceplate needs to come off anyway so swapping it is easy.
Note: the faceplate screws into the light switch; make sure that these two materials match each other before beginning.
-Needle nose pliers
-Wire stripping tool (optional)
Step 2: Turn Off the Power:
This is a simple step, but it is the most important part of this entire process.
Go to your circuit breaker (it will look remarkably similar to the one in the picture) and turn off the power going to the light switch you want to work on.
Now you can mess up anything you want/need to on the light without any serious problems. The danger is gone; have fun with the rest of this tutorial.
A somewhat related 15 second video: