I removed the drivers door 'card'..............strange name for a modern car inner door cover!!!............it comes off easily to start with then gets a pain, as there is a metal cover in between the trim and the outer door skin.
This is hemetically sealed, and there is all sorts of stuff fitted to it like the side airbag control/contact box(do NOT drop it, if you take it off!!), and then there is the electric window lifter motor etc.............but if you have to get in there.........carry on, I did not HAVE to get in there, as I was investigating the idea of fitting some door deadning pads, to make the doors less of a clang, and more of a thud...........so to speak.
Ian