Pull it away from the car itself. since your screw is gone anyhow you can move it over to be able to get your fingers behind it and start it off slowly. I find it helpful if you pull on one side first, meaning start by pulling either the top or bottom to release that one side of the clip then do the opposite side.
So basically put your fingers at the TOP of the piece and pull towards you ( pop ) then put your fingers at the bottom ( pop), then move to the next clip.
not sure if that helps at all.
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