It's very hard (if not impossible) to get it off w/o breaking the snaps.
You can get new ones from the dealer or use some other method to re-attach it.
Push the bottom rear of the panel forward to slide the bottom pin out of the bottom slot. Then push the panel up to release the 4 upper pins from the slots. The edge where the B-pillar meets the roof panel stops the side trim piece from sliding up high enough to clear the pins. Push it up and pull the bottom of the panel away from the body until the clips pop out of the slots. They will probably get busted in the process! But you can get clips.
BTW thanks for the 2 LIKES on my rig. Have to do the same for your ( holy cow!).... THREE!!!