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Compressor is straight forward as far as installation, it is all of the other details that can get you.
Replace the Orifice tube and the Accumulator/dehydrator. Flush the condenser, Evaporator and all lines. After you seal the system back up and add oil, you need to evacuate the system and check for leaks.
If you do not have a vacuum pump, or access to a vacuum pump you will have to find a shop that will evacuate it for you. If it holds vacuum then you are ready to charge, if vacuum does not hold pressure test with nitrogen to find leak, fix leak, and pull vacuum again