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I think it's easier to remove the screws through the vents before you remove the frame and then pop the vents (after you see how they work) before you re-install. Just a suggestion.
You HAVE to remove the border. The air temp ***** WILL come out. Should be 4 screws in each corner of the headunit. You CANNOT take out the screws if you don't remove the border. This is the easiest car I worked on..