Self-esteem and self-confidence are key issues for any writer. Copywriters and writers, whether employed or working as freelancers, need to maintain a strong sense of self-esteem in order to do good work.
If you write for a living, you have probably noticed this yourself. When your self-esteem starts to slip, then your work performance declines as well.
Self-hypnosis can help; it is a way to tap into some subconscious reserves of inner strength. Try using a hypnosis CD program.