You will need to pry some of the dash pieces off. There are tools made for this purpose. Car stereo dealers should carry them. If you can't find them, you can go to
http://www.crutchfield.com. These tools are plastic and do a pretty good job without marring the trim pieces. You might be able to use a small putty knife, but make sure it's plastic. To remove the stereo, I started by removing the trim around my shifter (I have a six-speed. I am not sure what the automatic console looks like, so I don't know if you need to start there or not.) I pried the trim around my shifter using the tool I mentioned above. This gave me access to the screws securing the trim for the fan/heater, A/C knobs. After removing those screws and removing the fan controls. I had to use the pry tools to remove the oil pressure and G-Force gauges. This gave me access to the remaining screws that attach the trim around the stereo. I take it that you have a Maxima because of your ID, but I have a Sentra, so obviously your dash trim configuration differs from mine. If it doesn't have obvious screws showing, you will probably need to pry them off, but start at the bottom of the dash and work your way up. I hope this helps. Let me know how it turns out.
Mike