Simple phobias are the only type of anxiety disorder for which analytical therapy is not usually necessary. There is not really any need, in most cases, to look for a "root cause" of the anxiety, as the anxiety is only present when the phobic trigger is present. Such phobias are treated with a combination of suggestion and neuro-linguistic programming techniques. Effectively, the subconscious mind is re-programmed to experience the previously terrifying subject in a new and different way.
Usually one or two sessions are sufficient.