According to the Haynes manual (in the UK) this is as simple as disconnect top and bottom pipes, and lift clear of the radiator. Are there any bolts/clips securing the condenser to the radiator? This is a 1996 Z28 M6 if that makes any difference.

Other than getting the A/C guy to recharge the system is there anything else that I ought to know?

 

The radiator and the condensor are interlocked with some plastic "clips" that are molded into the sides of the units. Just be careful separating them so as not to break these features.