removing interior pieces for paint, help

Hi everyone, I am in the process of removing bolt ons for paint and body work and am a little stuck on the interior. I have a 67 Barracuda FB. The pieces I am stuck on are the black metal panels that surround the area under the 1/4 window and branch up to the back glass. I removed the vinyl/cardboard panels, the aluminum carpet holders, the back seats, the black long piece directly under the back glass, and all the noticeable screws holding the black pieces in place. I can tell by the lip on forward area (at the door jam) that the piece has to be taken away from the 1/4 towards the seat and then slid forward towards the door but I cannot pop it free to slide it forward. What am I missing??? I haven't removed the floor piece (behind the back seat) under the glass. Is there something there I haven't seen? I feel if I pull any harder its going to break something:(


As always thank you for all the helpful information:)
Robert