Let me save you the time, money, misplaced sense of security and potential hospital bills:
Eyes, Nose, Throat, Balls
You hit one of these and you run like hell.
The best training for self defense is the 200m sprint
Agree, and that's a lot of what is taught in Krav. It's not a traditional martial art focused on katas and other fancy bullshit, or MMA/Muay Thai that has rules, Krav is about doing max damage and getting out of a bad situation.
Knowing where weak points are at, and having the muscle memory/training to strike fast and hard are two different things. Just because you know you should strike someone in the throat doesn't mean you will be very effective at doing that if you haven't practiced it, or learned how to defend yourself in a situation where you don't manage to strike first.