Fan Clutch replacement for 75 Imperial- how easy/tough to do?

My son believes our 75 Imperial's fan clutch needs replacing. We're kind of novice chimpanzee mechanics (if the job takes a normal guy an hour, it takes us 5!). Before we tear into the car, I would like to know if this job is doable for us. Any ideas, tips, advice is appreciated. Thanks.
Author: tdzik