Safety first. Clutch lock, steering wheel lock, removable steering wheel, kill switches, take out your battery, park in the garage, the driveway, outside your window, paging alarm, whatever you can do.
You can shoot or attack 'em if you dare but realize that if one of them sees which house you came out of, it's just as easy for them to gather their own buddies and come back to your home for revenge. It'll just place unnecessary danger on whoever you live with and anyone else that lives in your hood. Think before you act. Thieves won't give a shit about who they hurt if they're out for revenge because you shot at them. Your life > your car.