I'm an angry person, angrier than most people would imagine, I get flashes of anger. What works for me is working out when it's useful to use that anger.
Anything that's different from your own realm of experience as a human being, whether it's driving a car or a boat, or using guns, anything that separates you from yourself and leads you more towards this character's existence is a big help.
The University of North Carolina provided me with every tool necessary to rise to the top of my profession.