hmm for mine (08 speed3) there was one screw under a small cover (pry out with flathead) right under the door handle and the whole door panel is attached with clips that you just yank out. which will expose the window switch which you just unscrew to remove. but becareful not to break the clips. they are about 3-4 bucks EACH clip.
i figured the new speed3's would be somewhat similar. hope that helped.