Halfler03,
I just recently installed an AUXGMv2 in my HU(noBose/cdchngr). There's a good thread in here somewhere on how to remove the dash,I'm not sure exactly where it is.
Simply just apply EM brake, shift down to 2nd or 3rd gear to get the shifter out of your way, and the dash face trim just pulls out. No screws. Start from the left or right side, and pull out about an inch all the way around. Tilt your wheel down, the only resistance I had was the plastic around the gauge cluster. Once that's out, the HU is just 3 screws. Good luck!!
Stevie P