Hypnosis cannot make you do anything you do not want to do. Your mind will not accept suggestions that do not conform to what it believes to be true. If you do truly want to change a bad habit or acquire a new one that better suits you, then this could be the answer. From Freud to Jung, many professionals have used these techniques with great success.
For the person who wants to better understand why they are here and why they act and feel the way they do, Past Life Regression helps to resolve many questions one might have. Understanding Past Lives may help one to understand more about their purpose and why they are here. For more information read Many Lives, Many Masters by Dr. Brian Weiss M.D.
For the truly Spiritual person there are the Lives Between Lives Sessions. They help one to understand their Karma and the lessons they have to learn or have learned. These sessions more than any others, helps us to understand our own souls' journey and its' meaning to our spiritual development. For more information read Journey of Souls and Destiny of Souls: New case studies of Life Between Lives by Dr. Michael Newton PhD, the Pioneer in the field. These books and many others are available at the Merlin Centre bookstore.