The wire I ran is Stinger Pro Series 1/0ga with a Red Techflex wrap. To get from the front of the battery to the middle of the spare tire well, it will take about 21-22 feet using this path.
To get this ran, most of the items will pull out by hand, no need for tools. Be gentle, yet apply some smooth force and the clips will come out.
1. For the kick panel, just slide your hand under it like so, and pull, you will feel the clips 'click' out.
http://www.blindbug.com/wp-con...7.JPG
2. For the side panels, going back (the rear is the same), again slide your fingers under the panel and pull up/towards the inside of the car. Once you feel the clip come up, slide your hand down 6 or so inches and repeat until all the clips are out.
http://www.blindbug.com/wp-con...8.JPG
3. For the middle section, you can slide your hands in and pull towards the inside of the car. I couldn't quite get the whole thing off (although I really didn't start pulling on the upper portion). I pulled the (2) or (3) clips that hold the bottom portion of the center pillar panel down and that gave me enough room to work. Don't worry that the rubber molding will 'come up', when you go and clip the panel back in, you can use a small flathead screwdriver to pull the rubber back out (simple, not complicated).
http://www.blindbug.com/wp-con...9.JPG http://www.blindbug.com/wp-con...3.JPG
4. If you want to pull up the little clips that are under the panel (they open like a clamshell), you can see in this picture that there is a little tab to the right of the clip. I was able to put my flathead screwdriver into that tab, and pivot off of the top of the clip itself. It took a bit of fiddling, but I found that they actually came off easier when I applied a lighter touch. You don't really have to 'open' them however, since I easily had enough room to push/pull the 1/0 ga wire through the clip with ease.
http://www.blindbug.com/wp-con...7.JPG
AS FOR RUNNING IT THROUGH THE FIREWALL
There are a lot of locations you can run this wire through. I looked for about an hour and a half before deciding to run it where I did. After a lot of hacking at the floor, I got access to a half-tennis ball sized grommet. It is to the left of the parking brake, and wires go through them. After a lot of fooling with screwdrivers and such, I found I could cut a small 'cross' into the lower portion of the grommet and stick my wire through without fear of cutting any existing wiring. Push a foot or two of wire into the engine bay and you can then pull it from behind the air box. The Grommet:
http://www.blindbug.com/wp-con...5.JPG Where it comes out:
http://www.blindbug.com/wp-con...7.JPG
To run it into the trunk, the rear seat comes out with ease... if you lift up on the seat pan, you will find a little pull, just give it a tug and the seat pan will come up.
http://www.blindbug.com/wp-con...4.JPG
Putting all of this stuff back on, is as easy as it came off... just push the tab into it's appropriate hole.
Hope this is helpful