Its all held in by clips. I started with a flat head, then got another long one, since the clips arnt close to the edge, and stuck it in far, and just pryd down, with a rag between my screwdriver and the paint. Basically you just pop them all out, i forget how many there are. At the top of the window/trim it hooks over into the window slot, and you just slide it up and off after the clips are all popped out.
I was careful because i didnt want to break or make the color of the plastic lighten due to bending, but it does take quite a bit of force to get the first one started.