Taking the door panel off ,be aware of the various switches and controls , etc.. The door panel on the Grand Wags has a mirror joystick that I tore apart during my first go. I would find a video to watch before I did anything. I successfully replaced a window motor on a 528e. Having a Bentley manual and an on line E 28 forum helps a lot Another thing is to have the other door open,in case of accidentally tripping the locks.
The Rat has only 2 wires going to the doors. I had the panels off doing the speakers. I did grease up the regulator whilst I was in there. The plastic panels can be removed by hand once the first clip is popped Another thing to do while the panel is off is to clean the door bottoms and make sure the drains are open. Be sure to make a new vapor barrier with a bag and duct tape
The Rat has only 2 wires going to the doors. I had the panels off doing the speakers. I did grease up the regulator whilst I was in there. The plastic panels can be removed by hand once the first clip is popped Another thing to do while the panel is off is to clean the door bottoms and make sure the drains are open. Be sure to make a new vapor barrier with a bag and duct tape