Turn off power at the circuit breaker
Verify the power is off with a voltage tester
Remove the outlet cover plate
Unscrew and pull the existing outlet out of the electrical box
Take a photo or note the existing wire connections
Disconnect the wires from the old outlet
Identify the line wires and load wires
Connect the incoming power wires to the GFCI line terminals
Connect any downstream protected wires to the GFCI load terminals
Connect the ground wire to the green ground screw
Tighten all terminal screws securely
Fold the wires neatly into the box
Mount the GFCI outlet into the electrical box
Install the cover plate
Turn the power back on at the breaker
Press the test button to confirm the GFCI trips
Press the reset button to restore power
Test the outlet with a plug-in tester if available