Remove 4 screws from the bottom. 3 are normal #2 Phillips, one is a security screw that looks like a 6-sided star with a hole in the center. The bit I used was marked T-20.

Use a Spudger or other prying tool to work around the edges of the metal bottom plate and unclip the plastic tabs holding it in place. There were 7 tabs, 1 in each corner, one in the front and 2 in the back about 1-inch each side of the center. This was pretty easy.

Pull the bottom plate off and set aside.