Read the NRA armed citizen accounts. Over and over again "untrained" citizens protect hearth and home. Some times coming to the aid of others. Training in my opinion is highly overrated. Mostly touted by those who want to sell one a class. Knowing your gun and its limitations and your limitations can be accomplished at the range. Draw and presentation can be done in your living room. For legal aspects one should consult a local attorney familiar with the state and local laws. (Note local attorney Brian Ciyou spent two years researching his book on Indiana handgun law)
Is training worthless? Of course not. Get all you can. Are you going to be a "gunslinger" I hope not.