I have on 03 Altima. I do not know if the 05 is the same but I imagine it is similar.
In the 03 it's pretty simple. You just pull on the ac control bezel from the bottom. It pops right off. There is one screw, unscrew it and you can pull off the whole bezel surrounding the radio and above. Then there are four screws holding the radio in place. Unscrew them and you're there.