Its a PITA.

I did it on my 95 civic, different gen I know.

AT the time I was removing my dash, and thus I beleive the only way to get to it, is to remove the dash. But before you do that, revoe the glove box (whicih you have to do to remove the dash anyway) and see if you have access to the bolts that hold it in. When I did mine. Just remember, if it is like the 5th gen civics, the A/C lines run into that too, so you will have to drain your A/C, and eventually have it refilled. not fun, and it'll gots you more than $100 to completly refill.