Just a couple of tips that might help you. First, try to get all of the old foam off of the headliner shell before you try to glue the new fabric on. After all, that is what makes them droop in the first place. I used a shop vac with a brush attachment, but there were a couple of spots that were stubborn and I used a scrub brush, carefully. When I got around to applying the fabric, I put on rubber gloves which made it easier to form the material into the shell. Without gloves my fingers kept getting caught in the material causing bunching/wrinkles. Also, don't forget to leave enough material at the front to fold it up over the shell. There is no trim there so you have to fold it up over to give a nice edge. The sides and back can just be trimmed flush as they are hidden under trim anyway. Hope this helps, good luck!