Remove the airbox.  Use a 10mm socket for the two bolts (red) and a flathead screwdriver to loosen the airhose (green) from the box.  You need to disconnect the airflow sensor connector (white) on the airhose.  Now, disconnect the part of the airbox that feeds from the grille (yellow).  There is a hook on the airbox that attaches to a hose (blue).  Unhook this.  Then, to remove the airbox, you want to pull up on the side closer to the back of the car.  It takes a little bit of finessing, but it doesn't require too much force to pull out.