Assuming the system is completely discharged,
turn the wheels to full lock right then shut off the engine, this will give you access to the manifold hose bolt
remove the bolt holding the manifold hoses on, plug or block the hoses off to prevent excessive atmosphere/debri entering the system, there are three or four bolts holding the compressor to the engine, remove the serp belt and then remove the compressor being careful not to tip it too far and catch any oil that may leak out, this oil needs to be replaced when you recharge the system.