Prepare all the materials and tools needed for the process. Prepare a circuit tester, an electrical tape, a flathead screwdriver, a pair of scissors, and an electric sealers kit. Then, make sure that you turn off the power at the main circuit box. Place a piece of electrical tape over the circuit breaker that goes to the circuit that you are going to work on. Unscrew the screws that are holding the plate cover of the outlets to the wall. Test the outlet using the circuit tester to make sure that it is not driving power. Place the insulator from your electrical sealer kit to the front face of the outlet or switch. Screw back the cover plate and then turn on the main circuit panel switch.