Re: firewall - if you remove this panel you'll see a gasket. The other side is under the battery. SEe the FAQ for the writeup on how to remove the battery. The trick is that you have to reset the windows and power seat.
The center console requires you to remove the shifter boot, area under the radio, and side panels. There are a few screws that have covers. To only get to rear of radio, see this writeup:
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