1. Its much easier to remove from the car if one of the front seats is removed.
2. The sunroof panel should be removed/installed with the vent option open. If you follow the instructions on the e34 headliner website deal - its much more difficult. Make sure to order a couple of the clips that go at the front end of the panel from BMW - chances are you are going to break them.
3. To remove the headliner at the rear (see pics) slide it one direction and it will drop out of the rear clips. When its time to remove the clips - use a set of wide mouth cutters - they will allow you to grab the whole thing at once and not snap the plastic. In retrospect I probably would have ordered clips for the rear as well in case something broke.
4. Its doable with one person - but having another set of hands makes a big difference.
5. Order some of the a pillar clips, sunroof clips and a couple of the oh-**** handle plastic cover's it will save you many trips to the dealer.
6. If you are doing a light colored interior - be prepared to wash your hand a lot. I did and got one smudge on the sunroof panel.
7. Its a bitch of a job.