I just did my mothers 05' Cadillac cts , pretty easy except rear glass . The four door panels are cake , only two torx screws a door . The back glass is easy once all the deck and side panels are gone , Pretty straight forward r & r , there is a hidden screw on the rear side panels behind the airbag logo , 7mm . Also had to remove the outer seatbelts from the floor to remove the side panels , I also covered the back deck with a thick towel before cleaning and applying the film due to a control type of box there .