The headliner in my 88 Cadillac De Ville is sagging badly. Can I take it out myself and replace it... inexpensively.

We have an online guide for replacing the headliner in a 1989 Cadillac, it should be about the same as your 88 Cadillac - this should be a great help to you. The full sized headliner kit will work for your 88 Cadillac car, you should save quite a bit of dollar bills by doing it yourself. Same goes with anything else in life, if you do it yourself; you can save a bundle.