I have a '93 525iT with 130 k miles. The driver's side rear door is rusting along the bottom, and the driver's front door is rusting in the middle as the result of a poor quality fix sometime in the past. Otherwise it's a great car and we would like to keep it for a long while. So, how hard is it to actually replace the doors rather than have the rust fixed (a losing game from past experience)? Is this a DIY project (I'm currently replacing the drivetrain in our e12 with a 3.5 euro, so my skills are okay)? Anyone have a set of front and rear touring doors in black (with NO rust)? TIA for any insight into possible replacement.

...tom