i did mine. it did not have gas in it cos it had not been regased since the engine rebuild. i recommend that you go get the gas pumped out of it because it is not good for you or the environment. down here in new zealand it will be done for free. it's nice having a govonment that cares
i did not have to cut anything to get all the air con unit out. all joints in the pipes have to be undone however. if you want i have some photos of what i did with the belt to get rid of the air con pump. the belt to use is off a 4age and the bracket for the alltenator is off a 3sfe.
the part under the dash was not too hard to get out either. it was just a matter of pulling the glove box off and undoing the 6 nuts to get the unit out. the split the plastic duct in half by undoing it. simple, and no saw needed.
there are alot of bracket that can be pulled off at the same time so have a look around.
roger