This video is from the Dummies video series. The video will describe the process of replacing a standard light switch with a dimmer switch. First you must pick a dimmer switch that has the capacity to control the light fixture you would like to dim. Add up the wattages of all light bulbs in the fixture and make sure it is less than the rated capacity of your dimmer switch. Next turn off the power to the existing switch from the breaker panel and test with a voltage meter. You will then remove the existing switch and attach the wires to the new dimmer switch according to the wiring instructions. Re-install the switch into the wall, turn on the breaker and test your new switch.