Many of the plastics interlock, meaning a hoop on one panel, and a hook on the other. Straight pulling will not release them. you have to angle the parts slightly. even if you break a tab or two it will not be the end of your panels. I think you may just be babying it a little too much. take a close look inside the plastic as some areas have phillips head screws to re-inforce the joint. sometimes moving a harness will reveal a screw.
