Just for reference, an average air wrench is not going to get that bolt off. Mine is rated at 300-something ft-lbs and it didn't stand a chance. You'd need a professional one.
What I did was I set up a breaker bar against the ground, and used the starter to crank the engine. It nearly lifted the car off the ground the first couple times, but it worked. Getting it back on is the tricky part, though. Might wanna just tighten it up as much as possible then bring it to a mechanic to torque it down.