What he said. I just did this install not a month ago (only diff between mine and yours is that yours is a limited, and you have an E locker, but same year other than that - at least according to your sig).
In any event, even if it's slightly earlier, it's easy. Like you, this is by far not my first HU install. I did tear everything out from the middle, but in retrospect I coulda just removed the faceplate.
There were no screws that I remember to remove the armest; just have to unscrew the 4x4 shifter knob. Once the faceplate is off, the only thing I did (and would recommend doing) was to unplug darn near every harness from the top part, to give yourself the ability to move the faceplate down and out of the way.
Once THAT is done, you just need to undo the 4 screws for the factory HU and remove that; then you'll see the factory amp. Removing that will be easy as well; and then you're left with the factory harness and the 2 antennas plugs. I only plugged the one in and my reception is fine, though my OCD nature with electronics (I was a Nuke ET in the Navy, and am an IT specialist for the gov't) dictates that I'll eventually install the Y splitter. LOL
If you need it, I believe I actually have the Crutchfield install paperwork @ home on PDF form.