FOR THOSE OF YOU THAT THINK THE CASTLE DOCTRINE SHOULD ONLY BE IN YOUR HOME AND ONLY AFTER YOU EXERCISED YOUR DUTY TO RETREAT. [BOTH OF THOSE THINGS ARE UN-AMERICAN]
SHOULD YOU OWN A FIREARM? SHOULD YOU CARRY? SHOULD YOU OPEN CARRY OR CONCEAL CARRY? ARE YOU PREPARED TO USE THAT FIREARM TO PROTECT YOU AND YOUR FAMILY?
These are the question you need to ask your yourself prior to getting in that situation. The NRA and other organizations have trained/certified instructors to help give you the skills you need.
Once you do use your firearm you need to be prepared for the legal ramifications even if you are in the right. USCCA has insurance that covers self-defense incidents involving handguns or other weapons, whether you are on your own property or practicing open or concealed carry on public property.