Can a AC compressor clutch be replaced without replaceing the whol compressor? And how do I Replace the AC compressor if need be?

 

You could replace just the clutch, but it wouldn't be easy.

I would just get another compressor. To install it:
1)Have the ac system drained by a professional.
2)Unbolt lines from compressor, unclip the electrical connector.
3)Loosen belt adjuster on the alternator
4)Unbolt and remove the old compressor.
5)Bolt in new compressor
6)Tension belt.
7)Reconnect ac lines and the elec. connector
8)Have the system recharged.