Someone here has a list of recommended shops around the U.S. That might be helpful.
If I have something I can't do I always check with the local BMW club for what shop is currently on the good list. If there is a cars and coffee in your area that would also be a good place to talk to BMW owners.

__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas