AC Condenser leak

According to a car repair guy, I have an AC leak in my condenser. I haven't bothered looking for it, but I know there is a leak. The guy wants to charge me $500 to replace it. I saw on Autozone's website that I can get a new condenser for $145. Can anyone tell me how difficult it is to replace an AC condenser? I have a 1998 Malibu 4-cylinder.

Thanks!

Okay, I guess no one has replaced an AC condenser before. Next question; does anyone know where the low-side AC inlet is for a 4-cylinder 1998 Malibu? I have a Haynes manual for this series of car, but where it's showing a tube, my car shows nothing.