Penelope Trunk has a great post titled 4 Tips for being your own career coach. These are her four tips:
1. Talk to an imaginary coach.
2. Ask yourself better questions.
3. Pretend to give advice to someone else.
4. Believe in your ability to make positive change in your life.

I think the last one is the key to change. As Penelope puts it, “believing in yourself is half the battle”.