Verified answer

For temporary repair, replace a/c clutch if it is also locked down. It will free spin allowing engine to run when belt is in place. This is not really as complicated as changing compressor. Once compressor locks down it is only good for a boat anchor. (Unless you own a machine shop)

Proper replacement of A/C compressor is not a job for a novice. Dangerously high pressure lines are in place.

You will probably have to replace the compressor. It pretty much bolts on and plugs in as a unit BUT It has some pressurized lines coming into and out of that will need some professional tools(and skills).

You replace it..............

You first locate the freon leak/leaks in the system and along with repairing them you replace the a/c compressor, the accumulator, the liquid line, all o-rings, flush out the complete a/c system and evacuate and recharge add freon and oil......