It's not too bad- if you have small hands! /ubbthreads/images/graemlins/smile.gif
There is a wire that goes around the whole plastic unit and it needs to be removed, then the unit can be pulled out from the front side. The wire is sort of spring loaded and if you can get a pair of needle nose pliers behind the dash, grab the lowest side you can get a hold of and pull it off. Then push the unit out from behind. You can pull from the from after the spring is gone, but usually the plastic is brittle and will break easily. Does this make any sense? If not I'll try to post a picture for you.
Mine fit snug enough that I didn't put the retention spring back on when I put it back together.
Hope this helped a little. /ubbthreads/images/graemlins/crazy.gif