For those of you who are nervous about busting something when removing your door panels. Some of us have done this so many times we could do it blindfolded, something that I wouldn't recommend by the way!Tools needed:
Philips screwdriver
Flathead screwdriver
This is for S13 with power windows and locks but if you have manual then it will be even easier because you can skip a couple of these steps.
Nothing to it! First you need to open the door...duhhhh!!!! 
Look down in the pull handle and you'll see a rectangular plastic piece. This is the cover for the screw that you need to get to. 
Remove it with a flathead screwdriver to gain access.
The screw.
Use a phillipshead screwdriver to get it out.
Now you want to get the joint covers off the door handles. With your fingers or a flathead screwdriver you can pry the joint covers off the door panel then pull the handle open and manuever the joint cover around the handle to completely remove them.
Joint cover.
Next, look in the corner of the door and you'll see a screw that needs to be removed. Pop the cover and use a phillipshead screwdriver to get it.
Now you can use a flathead screwdriver to pop the door panel away from the door. Just insert it around the door panel in different places and use a little force to pop it off. Once you pop one section away you can just use your hands to pop off the rest of the door.
When you've popped the door panel off the door and you have power windows DO NOT LET IT GO!!! There is a harness connected to the panel that needs to be removed first.
This is the harness for the power windows and locks. Simply grab the tab, press and pull it out of the connector.
Done! To put it back just reverse what you did to get it back on.
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