Great write-up, i'm not bold enough to attempt this without a lift (having the car turned on with jacks scares me), but it seems relatively simple from a mechanical standpoint. I'm at about 38k right now, but when I get to 60k or so I think i'll be swapping the fluid as well, I don't buy the whole "lifetime" argument. That's a beautiful E88 by the way..
E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII