Wow, where did they go??? Goto:
http://www.toyotanation.com/forum/showthread.php?t=220377
To replace the radio, follow step 1, then take out the 4 screws on the side of the radio/cd unit/storage box unit out. I believe they use an 8mm socket wrench and are also philips, but use the wrench to avoid stripping the screw. Lift the unit and take it out. Unplug harness and antenna. To install, do the reverse.
For the AC/heat, you need to take off the black trim. Do everything til step 5. After that, I can't really say cause I only had to replace one bulb back there (the inside outside air) and that one was really hard to get to because there is a metal rod that goes to the glove compartment. To install, do the reverse.