Replacing the clutch on an AC compressor might be a foolish move. These clutches are electric and don't make much noise even when they fail. In fact, they form one solid unit to turn the compressor when the AC is on and should only make noise when off where they are allowed to free spin without turning the compressor.I would more believe the noise to be coming directly from the AC compressor itself and buying a new or junkyard compressor will come with a new AC clutch attached anyway. I just bought one for $150 from a junk yard in California with a six month warranty. As for the ease of installation... well, if you are mechanically inclined it isn't so bad. Much better if you have the proper toolsThe problem with any AC work is in the refridgerant itself. You see, that stuff isn't cheap anymore and you want to save it as best you can. The best way to do that is to bring the car to an AC shop and have them extract the refridgerant for you. They will note the quantity and charge you one fee for its removal and recharging later.With the refridgerant removed, you can remove and replace the compressor like any other part of your car. When you are done, take it back to the same AC place with your ticket showing how much refridgerant was removed before. They will then recharge the system and only charge you for any additional refridgerant the system needed. Be aware that it is a very good practice to replace the AC dryer at the same time as the compressor and may be required under the compressor warranty.Good luck!