Turn off power to the light fixture at the breaker
Verify the power is off with a voltage tester
Remove the light bulb and fixture cover or shade
Unscrew the fixture from the ceiling mounting bracket
Support the fixture while disconnecting the wires
Remove the wire nuts and separate the wires
Disconnect the ground wire
Remove the old mounting bracket if replacing it
Install the new mounting bracket if needed
Connect the new fixture wires to the house wires
Connect black to black, white to white, and ground to ground
Secure the wire connections with wire nuts
Tuck the wires into the electrical box
Attach the new fixture to the mounting bracket
Install the bulbs and any cover or shade
Restore power at the breaker
Test the new ceiling light fixture