Overheating, need recommendation

I've searched the threads on here and the car is overheating when idling for long periods of time. The car is cool at highway speed so it looks like the fan clutch is the culprit. The fan doesn't spin too easily by hand when the car is cold, and it's the same when the car is shut off after it's been run. I am at school and don't have access to my normal tools so I was thinking the clutch replacement is something I could do in the parking lot, just by removing the fan shroud and the fan. Otherwise I would opt for an electric fan setup. Am I better off getting a Ford replacement from somewhere like 50Resto or going for the SSP fan clutch?

Thanks.