How to Replace a 120-Volt Electrical Wall Outlet
Step 1: Turn Power Off at Circuit Breaker
Turn off the circuit breaker that powers the electrical outlet you plan to replace. To determine which breaker is the right one, plug a lamp, hair dryer, fan, or radio into the outlet and turn it on. That way you will be able to either see or hear the device go off when you flip the right breaker.
If you’re not sure how to turn the power off to the outlet, flip the main breaker to shut down power to the entire house. As a precaution, test both plugs of the receptacle with a voltage tester to make sure the outlet is not conducting any current before proceeding.