btw, i did all this in one night. i took the headliner out and did it out in an area that was ok to get that spray glue on because once its on, its not coming off.
stuff you will need: suede, heavy duty spray glue (3M 90 Hi-Strength Spray Adhesive is what i used). be sure to measure out how much suede you will need too. it can be kinda expensive depending on the type you get. i bought 2.5 yards for my extended cab and had a little bit left over.
i went to a fabric place and picked up some suede and a little bit of actual headliner just to test it out. i wasnt sure if i had to remove the original headliner from the ceiling mold or what and i didnt want to mess up mine if i did it wrong. the glue worked perfectly on mine. i sprayed it over my existing headliner because i was told that if i removed the headliner from the mold that the glue used underneath it would cause bumps and wrinkles when i put the suede on. that also gave it that plush feel.
i worked from front to back because that was lengthwise for me (DO NOT work widthwise, the glue dries too fast). if you have a reg cab work in the way that has the shortest width, whether it be from front to back or side to side i dont know.
spray only a little at a time and work that down on the headliner, then move on. dont be afraid to stretch the material, just realize that if you do, you might pull something loose from and area that you already glued down or it might wrinkle or create a bubble, but you should have many problems with that.
also, i did something that GM didnt do with their headliners. if you look at your headliner you will see that the material isnt folded over the sides and edges. it stops at the edge of the mold. i, however, folded mine over the edges because it would have been a pain in the butt to try and cut out an exact shape of the headliner and not have something go wrong. just a suggestion.
dont rush, work slowly and watch how you are working. be sure to look back to see that you didnt mess up an previously glued down suede by pulling too hard or whatever. i sprayed the glue well, held the suede in one hand, and used the side of my other hand to flow over the laid area just to smooth it out before proceeding on to the next gluing area. be sure to cover the area in glue before laying down the suede. it'll tell you on the spray can how to use it. no worries.
if you have any other questions just holla. good luck!