Nim

I installing a stereo system in my A4, and wondered if anyone knows how the trim piece on the inside of the door frame is attached? I removed the panel to the left of the clutch and then attempted to remove the trim piece along the side of the car (to run a 4 gauge power wire), but it's on there pretty good. Didn't want to pull to hard and break something as I figured there may be a trick to getting it off, seeing how easy the rest of the interior is to take apart (door panel removal only took a few minutes). Anyone here done it before?