Sorry I didn't see your post sooner, cut it on the back its easier so you're not dealing with the bumps. A jig saw with a nice blade makes easy work of it, drilling a hole to get it started on an inside void like a door handle hole with a bit larger diameter than the blade is a must. It might be possible to cut it with a rotozip bit but the torque and spinning isn't as easy to control as a jig saw. Just make sure you go at a slow even pace to keep blades from snapping. Gloves and goggles are a good idea too. If you do a google image search on diamond plate door panels some pretty good results come up for ideas.
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