Ed is back at Va Speed? When did this happen? Last time I was there, he had left.
As for the compressor, it's a pretty straight forward job. Like Ron said above, belts, water pump have to come off to replace it. Find the low pressure side shrader valve and give it a push. If you hear hissing, like air coming out, then you "should" have it evacuated first. That's up to you. It won't do the system any harm if you don't, but there are federal laws governing recovery of refrigerant.
You WILL need a professional to vacuum and replace the R-134. Also, since you have to remove the water pump anyway, might as well replace it also. It isn't a big ticket item, so two birds with one stone thing.
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