Hello, I am trying to remove my headliner for my 1998 Olds Cutlass GLS. I have every clip out except for the swivel for the flip fown mirrors on the driver and passenger side ceiling. I am trying to get my headliner off to install an LCD flipdown screen. All of the other clips I got off with a butter knife, but these don't seem to budge. Any help would be greatly appreciated!

Thanks again!
Zach