Not to disclaim anybodies asskicking abilities, you really can't know how you'd do in a fight until you actually get into a fight. No matter how much training someone has, if they can't adapt to the pressures of having clear and present danger right in front of them they will lose. I was a competitive boxer for five years and have seen plenty of people hesitate when they need to make a move. In a real fight, hesitation is the same thing as letting your opponent/attacker kill you.
Also, most martial arts schools available to the public don't normally teach their students anything applicable to a real combat situation. They're geared to get asses in seats paying membership fees and not teaching you something that could kill somebody and get you thrown in jail.
Speaking from firsthand experience I would have to say that if you wanted something that could be used in a life or death situation, find a real mixed martial arts gym, learn wrestling, or join the military. If your just looking to be able to kick ass and kill if neccessary, just get a guy who is ex-special forces to teach you a thing or two.
Lastly, if you don't know anything about fighting and find yourself in a situation where you have to defend yourself from extreme violence(worst case scenario), try to use anything and everythig you have on hand as a weapon. do anything you can to put the person in front of you on the ground and then run for help. Remember, in real life there is no fighting fair, there is only making sure your ass doesn't get killed.