This can be a tricky job, and probably costly once parts start being broken. You will need a proper tool also, just using a screwdriver probably won't cut it. Get a chisel at least 5/8" wide to 3/4". You will notice a seam between the plastic cover and the grey housing unit, place a sharp chisel between the two as shown in the photo, then carefully twist the handle of the chisel to the right or left and you will see the two separate, pry from the other side if need be to release the cover. The local auto parts store had the replacement bulb for (2/$5), simply replace it and snap the cover back into position with your hands. This could save you up to $20 from having another source do this simple task.
