I replaced both my door handles a few months back because of rust. They are a pain in the ass if you have never done it before. After you get the hang of the first one though they are pretty easy. Here is a short walkthrough from what I remember, some things may be different or a little off.
1. undo all the screws, located on inside handle, down low on the inside panel and a few in the middle I think
2. You will need something to take the roll up handle off if your windows are manual like mine were. You can use a piece of cardboard with a notch in it, or you can buy a door handle remover tool from a car part store. Basically their is a piece of small metal that you are trying to push out.
3. Another tricky part was when you have to take the inside door handle off, this is done by lifting two medal rods off pin hooks, and by undoing a cotter pin.
4. Take the panel off and you are left with a bare metal door. I am not sure why they have so much metal showing, maybe for accident protection. Anyways this makes it difficult to access the door handle from the inside. You must have lots of patience and a long pair of needle nose pliers. You need to pull off some more metal pieces that are holding these alligator looking jaws in place on the door handle. Not sure of all the correct terminology so bare with me here. Then you push up the alligator pieces and your door handle is free. When you put the door handle back you should put the metal pieces back that hold the alligator pieces in, but I didn't on one of mine and it seems to be fine.
Not the best write up, but let me know if you need more help.