Very carefully. Seriously, the last set i removed i started at the front point and used my clip removal tool with a thin board under it to prevent denting the quarter panel. Pry up the front and work your way to the rear. There are also screws on the lower part of the vertical piece. There is also a clip under the vertical trim that requires you to slide the trim straight up, although mine doesn`t have those clips.
And Welcome to Tri Five.
Terry