the small bolt is NOT behind the door handle insert. it is behind the trim piece that holds both power window buttons(or on the right side door, the single power window button). Once you pop that trim piece out, you'll see the 8mm bolt.
if the problem is with the switch, no need to remove the door panel.
then, behind the little safety light lense(bottom, rear corner of the door panel), there is a single philips screw.
then, you might have to oop up the little triangle at the side view mirror(some do, some dont-I do). then simply lift UP on the whole panel, and it comes out.
out of all the intricate design features on the Mark VIII, the door panel has to be the simplest thing to physically remove from the car. I guess they expected some reason for doing so.