Pulling the stereo out is easy. Remove the surround around the shifter (it's held by tabs and pops up-be gentle!!!).That exposes a set of screws that removes the surround around the stereo and climate control.
when you pull the OEM stereo forward its got an adaptor connected to it. Simply disconnect it.
The thread below has some useful info about going aftermarket.
http://forums.nicoclub.com/zer...guide
Currently in the Garage:
Daily Driver: Acura EL
Daily Driver: Saab 9-5 2.3t Aero Sportwagon
Spring/Summer/Fall Screamer: '94 Infiniti J30t gold package w/HICAS (10+ years of ownership and she still looks&runs like day one!!!)