There is only one screw, the whole thing is held on by snap fits. The only advice I can give you is to be patient and take your time trying to pry it off. I broke a couple of the clips when taking mine off which is no big deal.

As for the wire harness, until you get the control module removed from the seat, you do not need to undo the harness. There are 2 or 3 wire harness connections behind the control module that need to be disconnected when replacing.