One woman dedicated a year of her life to following all of the advice from various self-help books and turned it into a blog called The Happiness Project. You can find all kinds of useful ideas about how to become happy at her site.
After you read through and implement some of the advice, you might find you get stuck in places or you just can't seem to progress as far as you'd like. If you have made a conscious effort to be happy and you have not reached your goal, this is when hypnotherapy can be the most effective.
Hypnotherapy removes the roadblocks to happiness by enabling access to the subconscious part of our minds. All of our negative beliefs about ourselves are stored in the subconscious. Using hypnosis, we can find those negative beliefs and release them. When the subconscious and conscious parts of our minds are in agreement about what we want, this is when lasting change can take place. True happiness is attainable; it's as close as we believe it to be.