Plug a circuit tester into the outlet. Ask a friend to watch the tester while you go turn off the power supply to the room from the household breaker box. When your friend tells you the circuit tester is no longer lit, you will know you turned off the correct breaker switch.
Use a small flat head screwdriver to back out the screws that hold the electrical outlet's face plate to the electrical box. Remove the face plate and set it aside. Put the screws in a safe place, such as your pocket, so they do not get lost.
Back out the screws that hold the electrical outlet onto the electrical box with a Phillips head screwdriver. Pull the outlet about 3 inches away from the wall; the attached electrical wires will follow it.
Loosen the screw terminals on either side of the electrical outlet. Unhook the electrical wires from around the terminals. Set the electrical outlet aside.