Turn off the circuit breaker
Verify power is off with a voltage tester
Remove the existing outlet cover and outlet
Identify LINE wires and LOAD wires
Connect the incoming hot wire to the brass LINE terminal
Connect the incoming neutral wire to the silver LINE terminal
Leave LOAD terminals unused unless protecting downstream outlets
Connect downstream hot wire to the brass LOAD terminal if needed
Connect downstream neutral wire to the silver LOAD terminal if needed
Connect the ground wire to the green ground terminal
Tighten all terminal screws securely
Fold wires neatly into the electrical box
Mount the GFCI outlet into the box
Install the cover plate
Turn the breaker back on
Press the TEST button
Press the RESET button
Confirm the outlet is working properly