Tips on doing it yourself:
#1. Make sure you use a spray adhesive specifically marketed for repairing automotive headliner. I would use this stuff or similar:
3M Super Trim. Otherwise your liner will sag and you will have done 15 hours of work [for nothing]. If you don't go OEM with the fabric, Joann's Fabric and other fabric stores usually stock auto headliner.
#2. Getting the sunroof panel in and out is a b!tch and requires removal of the sunroof itself, but there are several online how-tos out there that should help.
#3. After you rip the old fabric off of the headboard, make sure to get as much of the old glue off as possible before attempting to adhere new fabric. Make sure you generously coat both the back of the fabric and the headboard (but from a spray distance of at least 10 inches; otherwise the adhesive will bleed through and ruin your new fabric), letting each dry for a couple of minutes before re-adhering.
#4. A nice detailing adhesive for areas like the A-pillars and the edges of the headboard (once you've trimmed it) is rubber cement. Using the same 2-sided dry and adhere method, this stuff works really well for securing the edges of the fabric.
Good luck!