What year car? Does it have power windows & locks? Not that it really matters, you just unplug those after pulling inner door panel off, and carefully pull wires & plugs, as well as the rubber grommet, off the door. Put a floor jack under the center of the door to support it. Unbolt the door from the hinges, pull it away, it's off.
I'm not sure what you mean about pulling the door skin off.
The window crank can be a pain in the butt. Patience is the key to succcess. I've done a couple a long time ago and I can't recall all the the right moves to make, but it will be easier to get it out after the door is off. Lay it on a table if you have one. It was less frustrating for me, sitting on a stool doing the surgery.
Hope it helps, I know it's not much.
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