Replacing a light fixture is one of the simplest and most effective ways you can dress up the interior of your house - or the exterior. And it’s very simple; all you need to do is remove the mounting screws which more than likely, are two screws on either side of the mounting plate. And then, obviously you want to turn off the power at the breaker. But after that, it’s really a matter of untwisting the wire nuts, removing the wires, and then doing the same process in reverse. Twisting the black one onto the black wire, the white one onto the white wire, and then remounting it.