As I recall the following steps in approximate order. It is good practice to have a few extra plastic panel securing fasteners on hand. Dealer or big box auto parts will have.

1. Remove upper chrome trim plate on opening end of door.
2. Remove chrome trim plate on hinge end of door
3. Remove "C" shaped trim plate around latch
4. Carefully pry cover plate covering inner door handle trim. It is
plastic and brittle. Use a knife blade.
5. Remove screw securing inner door handle trim and remove trim.
6. Remove the screw holding the front end of the arm rest.
7. Using plastic tools, unsnap the panel securing fasteners along the
bottom and side of the panel.
8. Grasp the panel at the bottom and at the rear of the arm rest and lift
straight up. The upper part of the panel is sort of hooked along the
inner window frame.
9. Note how the rear of the arm rest hooks into the inner door body.
That may be the biggest pain to replace correctly but it is definitely
do-able.
10. Careful to not displace the speed nut for the front arm rest screw.
11. When the dealing is done don't forget to replace the plastic cover.

Good wrenching and let us know the results so as to add to the data base.