Learning about Happiness

Has anyone of you ever thought about changing your lifestyle to be more happy.
I am reading a book right now by Rubin Gretchen which is called "The Happiness Project". Really interesting to read. She talks about her own life where she applies one year of commitments to be happy. 
It is quite amazing what you can accomplish in just being more happy and how others feel that.
Although it is not really easy to do. Some days put you down and some others are better.
It is quite a challenge. To have more time for your family and put your priority's just more around the people you love is hard if you are real busy with work and everything.
What do you think?
Has anyone tried it out or any experience?