A) If you are concerned about getting sued, the NRA provides insurance for such things - I believe it was $250/yr for 250K of coverage.
I could be wrong, but before I joined anything like that organization, I'd want names of the lawyers signed on to it for certain areas, then I'd check them out, to make sure they seem competent.
A list of the participating attorneys is available, and the cost is far less than $250. The organization recommends checking them out, and suggests spending some time with one you choose ahead of time, to make sure it is a good fit, and so there is a clear understanding of what the attorney expects of you if you ever have to do the unthinkable and shoot another human.
Members also get DVDs that explain:
-When a shooting is justified,
-What to do if you ever need to defend yourself,
-What NOT to do if you ever need to defend yourself,
-What to say to the cops,
-What NOT to say to the cops,
-How to recognize an iminent threat,
-How to avoid threatening situations,
-Yada yada....
Yes, I am a member. Highly recommended.