Headliner -- Sunroof

Has anyone replaced their sunroof motor on a 325i? Help. How do you get to it; do you need to take-out the headliner?

Yes.
To get to the sunroof motor simply
take out the visors,
disconnect the sunroom motor switch,
unclip the system check,
slide sunroom back (manually),
loosen 2 headliner screws,
slide weatherstrip from the corners out from clamping the headliner,
walla headliner is out and you have limited access to replace your sunroof motor and relay.