Pull the dash bezel off.  Start at the lower-right corner, get your fingers
behind it, and just pop it off - it's held on with metal spring clips.
You'll want the steering wheel tilted all the way down, if you have a tilt
wheel, and shift into '1' if you have an auto (set the parking brake first).

Once the bezel is off, remove the screws holding the radio in.  Pull it out,
and disconnect the electrical and antenna connections.  All in all, pretty
simple...

www.bought4less.com , buy the new stereo there

then unsnap the dash trim,,, you will figure the rest out