If you're talking about the O-Rings where the lines attach to the compressor, just change them and not the compressor. To do it right you'll need a vacuum pump to evac the system after you change the O-Rings. When I changed my compressor, I drilled out the rivets holding the inner fender on to give myself easier access - but I was also cleaning up a power steering leak, and pulling the driver exhaust manifold.
If you're swapping the compressor, it comes out from the top and you have to remove the aluminum brace from the front of the engine - at least I did. Don't forget to add an oil charge if you replace the compressor. PAG-100 I think.
Make sure to buy a tree or two from Al Gore to offset the horrible destruction you're doing to the environment or ManBearPig will come anally rape you.
Brain damaged former Viper owning loser