A/C Condensor Replacement

I have a 95 Aurora and I have to replace the condensor for my A/C. I have ordered the part, but I would like to know if anyone else has replaced this before and if there is a a/c manual I can get diagrams and specs from. Will I need to change other parts as well; i.e. O-rings, connectors, etc. Also, will I need to vacuum the system?

Thanks in advance!