**DISCLAIMER** - At this point, I am sure any warranties on 2002 Proteges are no longer valid, however, you still do this modification at your own risk. I am not responsible for any damage caused, injuries incurred, or contracts violated by performing this modification. That being said, this is a fairly easy process, with almost no risk involved, but you are solely responsible for anything that happens by following these instructions.
Oh, and this one is totally reversible if you ever do want to change it back :)
All the pictures for this mod were taken with my cellphone, so I apologize for any that aren't perfectly clear. They get the point across though.
Step 1: Remove the car's trim.
Remove piece number 1. This is the long piece of trim along the bottom of the doorway. Simply put your fingers under the inside edge of it, and give it a sharp pull upwards. The first time you do this it may take a bit of extra effort, but it will come off eventually. :) Sometimes it's easier to start at one end and work your way along it. Check the pictures, they explain it pretty well.
Piece number 2. Next we need to peel back some of the door's seal near the front of the car. We don't need to take it all off, just pull it up until you can toss it over the top of the open door to keep it out of the way.
Piece number 3. This is the panel that covers the fuse box. First we need to pop out the little plug that is right at the far end near the pedals. This is easily done with a flat screwdriver. Note: you need to put the screwdriver under the inner circle of the plug to pull out the center, if you just put it between the plug and the panel, it will not come off and you could break it. After the plug is out, simply grab under the panel and pop it off by pulling towards the center of the car.
Now we can see our fuse box, and are almost ready to do the real work :)
On a side note, you may see a big, thick, shiny red wire or a skinny blue wire in some of my pictures, those are for my amp/sub in the trunk, so if you don't see those in your car, don't panic :) Also, these pictures were taken after I had already modified some of the wiring in the car, so anything that I do not mention that seems out of place, don't worry about.