There's a small plastic cover in front of the bottom of your NAV screen. Pry it open with a screw driver and then remove the 2 screws within. Now stick your screw driver in the gap between the AC control unit and the AC vents and pry; there are 3 clips on the left, right, and in the middle. You should be able to pop the AC vents + NAV screen assembly upward. You don't need to take out the NAV screen completely, just loosen it enough to get to the inner bolts. Then you can follow the instructions for the rest.