1. Insert a thin screwdriver at the outer most edge of each overhead lamp button, push inwards and down, and the outside edge will pop out. Reach in with a finger or two and pop the other side of each button out.
2. Remove the phillips screw visible next to and above each bulb.
3. Pull the entire unit towards the rear of the car. This take a little effort. Keep the unit flush against the roof while doing this.
4. Disconnect the two wire harnesses.