We've done a few where I work. Tough job, very time consuming. I'm obviously not here giving advice on one hand and discouraging DIY work on the other, but you may want to have a shop do this. The techs who have done this spend the best part of a day at it, and believe me, they try to do it as fast as possible while doing a neat job of it. I believe the headliner does need to come all the way out.
To resynchronize the sunroof, you simply push the roof switch to the tilt up position, and continue holding the switch in that position for an extra 5 seconds or so.
The steering angle sensor synchronization involves turning the steering wheel lock to lock a few times after initial start-up until the ESP/BAS light goes out.
Gilly
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