Did you try taking out the screws on the side of the bumper where the tail light ends? there should be two screws on each side. And i think you get to them from the inside of the trunk by pulling back the panels, should be 10mm's. all the other screws on the rear bumper should be easy to see.
nOPE, doesnt require you to remove your tail lights. the screws aren't directly under the taillights. hard to explain without pictures. they are bolted onto the edge of the quarter panel if that helps. =|