RE: Personal defense with deadly force
Let me add these comments to this thread. There are three problems to be
understood.  Problem 1, when to use deadly force, the circumstances and the
justification.  Problem 2, how to use deadly force, preparation, equipment,
skill, willingness.  And Problem 3, the aftermath, the laws in the
jurisdiction, the attitude of the cop writing the report, the attitude of
the DA reviewing the report, the the attitude of the Judge you may end up in
front of.  And their attitude and view of the situation is more important
than the written law in this kind of circumstance.
Problem 3 will be the worst part of the whole ordeal.
So learn and understand the principles and elements of the law that come
into play, learn the specifics of the local laws.

Recommended reading: Principles of Personal Defense by Jeff Cooper

Loren Busch
Long time firearms instructor
Former Personal Defense with a Firearm Instructor