Most true or incapaciting fears are irrational and out of proportion and can best be dealt with by understanding the reality of both the fear-causing issue and yourself. Once a bright light is shown on the issue and it is disected, or broken down to its basic parts, the fear can be drained. Additionally, understanding one's self and your reactions is a necesssary step to put the issue in perspective.
This is not to say this is easy, but it is doable. No one wants to live in fear, so the effort is well spent.
For fears that are real, understanding helps them to. Fear in proper doses, is adaptive, useful and protective. It can also be stimulating, thought-provoking, and energizing.
Unfounded fears, phobias and the like are generally a mistaken pereception resulting in a non-adaptive response. Desensitization is a common technique to treat such patients and invloves confronting the fear inducing issue in small doses (initially) in a controlled environment.