This electrical wiring project is best performed by a licensed electrical contractor. Replacing a light switch can seem intimidating but if you follow the right steps it can be done in just a few minutes.

How To Replace A Standard Switch With A Dimmer Switch For Dummies
How to change a light switch to a dimmer. Finish the job by installing the cover plate and turning on the power to test the new dimmer. First of all read all the instructions before you tackle any project. Turn off the power to the switch at the circuit or fuse panel. To replace a standard switch with a dimmer switch follow these steps. The dimmer switch is now installed and ready to go. Unscrew and remove the switch plate.
Place the dimmer switch completely into the junction box and use the two included screws to secure the switch to the box. Whatever you do dont cut the red wire. Then use a voltage tester to make sure that the circuit is dead. Use your flat head screwdriver and screw the faceplate in with the two included screws. Go to your breaker box and turn off the switch for the lightoutlet and the wall switch. Unscrew the switch from the electrical box and pull it out with the wires still attached.
Screw the dimmer to the box with the screws provided. It doesnt matter if you reverse the two switch wires to a single pole dimmer. Basic electricians pouch hand tools a non aluminum ladder and voltage tester. How to replace a dimmer switch with a light switch. Once the switch is secured take the faceplate and place it over the switch. Fold the wires neatly into the box.
Install a dimmer switch in 10 minutes and feel like a boss.