If you haven't taken apart a door before (or even if you have) I whole-heartedly reccommend a google search on how to remove it on your car. You'll find your identical door panel, and more than likely a video of somebody removing it and probably fixing the same issue you have. Whenever you're working on cars google is your friend... There are special tools but I have found you can usually do without. Your door panel is held on (usually) by some sort of clip. Unless it's screwed all the way around (rare), I'd try to have the clips on hand (they're cheap) prior to removal since you usually need some. I'd try to have enough for the entire door but expect to have some left over.
I've taken off door panels on almost every car I've owned, and even though I've done it quite a bit I still look online to make sure there aren't any pitfals, or more often screws hidden in spots I wouldn't have thought to look.
I don't tend to disconnect the battery, but it is a good idea, and I really should start. There are a few horror stories out there regarding air bags, and though the chance is slim for any issue, as said before, "if in doubt, just disconnect it."
Job *shouldn't* be too bad. Good luck.