How would one change out a r22 compressor,step by step.and replace with new ,step by step.

Its against the law to help on this one if you don't have your refrigerant card. If you do have a card you know how to do it. I'm not trying to sound mean but it's the law. Good luck.

I agree with T-Top on this also. If really interested there are books available for you to read and educate yourself. Just look on the net.