I did mine not that long ago, too.
I put a plastic grocery bag over the top of the door (to protect the paint), then used duct tape over that to hold the glass up (2 pieces). I used a die grinder on the rivets holding the regulator assembly to the door (those things are HARD). Then I used a 4" C-clamp to hold the spring in place while I drilled out the rivets holding the motor to the regulator. Swapped the regulator, putting a glob of grease on the new gear, then bolted it together. Released the C-clamp and everything was fine, then bolted the assembly back to the door.
I used a C-clamp with the little rubber add-ons to avoid gouging the metal and clamped it pretty hard. Worked fine on both sides.
93 Bravada Vin W
99 Safari Vin W
02 Astro Vin X