Before hypnotizing yourself, you have to know and realize how to hypnotize others. First of all, focus on improving your public speaking and communication skills. You are going to need these a lot! Secondly, try to practice in front of a mirror. Learn how to calm yourself and be relaxed.
If you want to learn how to hypnotize yourself to quit smoking you have to have a good motivational resource for doing so. Start thinking about things that you really care in life and you are going to succeed. When you are reading, search for a good hypnosis coach or program and you are good to go.