Installation of the rear interior lights was a bit tricky only because it takes a bit of guesswork and guts to poke holes for wires and find the mounting screw holes. A long sharp probe worked well here to find the holes. You'll also notice I didn't take the windows out (you're supposed to) but I wasn't feeling lucky and glass is sort of fragile ;-). I also used a little spray glue on the vertical pieces - may not be required if you remove windows.