Take a look at http://www.youtube.com/watch?v=FhgwHQCJwWw
, and consider investing in the DVD. It isn't a substitute for a hands-on class from one of the top tier shotgun trainers (Louis Awerbuck, Clint Smith, John Farnam, Tom Givens etc) but it's a good introduction to the subject.
Mindset - Skillset - Toolset. In that order!
Attitude and skill will get you through times of no gear, better than gear will get you through times of no attitude and no skill.