Great DIY. I'm about to do this, probably tomorrow, for my front-right door. I have two questions:
1. Is unhooking the battery absolutely necessary? I don't mind, but see that some have, and some haven't.
2. Did anyone replace the adhesive under the trim panel? I found this E90 trim panel removal video for a non-USA car, and the guy was a BMW tech and recommended replacing the adhesive, and using a roller to re-stick it.