on my 93 z i ave a blown head gasket so i went ahead and got some newly used heads from someone on this site!~ and i was wonder just how hard is it to get the heads off and replace them

 

It's not too bad man, just take your time, and make sure to chase those threads out before replacing the heads. Use thread seal on all the bolts that go into a water jacket, etc. I had to do this when I first bought mine. Not that hard, just a lot to try and keep track of and remember what wire went where.

Thunderracing sells a pretty good head swap gasket package. Comes with everything you'll need. I used it on mine.