The more you use a behavior, the more "old"/standard it becomes; it becomes a habit. So, you drill yourself on new behavior, including new thinking patterns so when things are initially frightening, they don't stay that way because you have a better way of looking at them to discharge the fear. Too, you work on known scary situations (like talking on the phone, for example) and work on making them not scary, so they cannot be part of a stressful situation at all anymore, cannot trigger or add to it.