I just had a local shop re-do mine. It was a PITA because of all of the corners and curves. But, they got it done and used new material. It is almost impossible to re-use the old material unless you have a way to "vacuum bag" it properly. Plus it looked like hell.
Here is one of many threads.... The "Search" is your friend...
Windshield header trim panel removal
Edit: I was just reading my instructions in the above link and realized that I forgot a step. Once you yank the mirror out, you need to remove the "rear view mirror bracket" and associated screws. The panel is secured to the roof by the rear view mirror bracket and sunvisors.