In order to replace the AC Compressor Control Valve safely, the AC system will need to be depressurized. This is best done professionally to ensure the refrigerant is disposed of properly.

Any automotive shop offering AC service can do this for half their 1 hour labor rate. In this case, $49 to evacuate the system.

Ask the shop performing this procedure to provide you visual verification that your AC system has been completely evacuated. Don't be shy.