The door(s) need to be off the rig to do this john.
Remove the interior panel including the window hardware/window, etc. And set aside.
Then simply go around the interior side of the door skin/inner overlay and drill out the spot welds that retain the skin to the door frame. They sit on about a 3">4" spacing around the door frame. The spots are rather small, so I think this could be easily done with say a shortened 1/2" bit that has had it's tip re-ground into more of a spot-facer.
Once the spots are drilled out, then ya just start trying to pull the skin away, you will find a few additional spots that you missed so deal with those as needed.