If I were to do it, I'd disconnect the battery, cut the lens off as best I could without getting too close to the paint or quarter panel, and then start hacking up the inside a bit at a time.
Once you get enough of it opened you can get a box wrench in to remove the four mounting posts and remove the rest to get it out of the way.
The panel behind it is just held in by plastic press buttons. I'd imagine you could push them out or pry them out from behind easily.
