The first rule of a gunfight: HAVE A GUN.
Some people think this is some sort of joke. It is not. It is a reminder that CCW only helps you if you can respond to deadly force with deadly force. If you cannot, you are at the mercy of your attacker. So, if you can legally carry a gun (remember we are the good guys here and no matter how much we dislike politicians we want to be on the right side of the law) do so. Carry one every day into every place that it is legal to do so. If you need to leave the gun in your car, make sure it is locked securely, then reholster as soon as you return to your car. Very simple.