Turn off the overhead lights and allow them to cool.
Scale the ladder to reach the fixtures while your assistant holds the ladder steady. Wear safety goggles to protect your eyes and face from dust, dirt and dead insects that may fall out of the fixture when the cover is removed.
Slide out covers that fit inside metal tracks, pushing in the direction of the track openings. Use a screwdriver to take out screws holding covers attached to the ceiling. Some covers swing downward on a hinge or hinges, which hold the cover while you change out the bulb underneath. Other cover styles remove completely from the fixture.
Hand the fixtures one at a time to your assistant below.