Yes many times. I go on fasts (distilled water only), and it is a great way to get your head in the right place for doing it. Or anything else for that matter. Start out a week or so before and do it every day setting a target date. When the date arrives, mentally you are ready. Providing you do it every day at least once. More if you have time.

Another book that you can download is the audio version of The new Psyco Cybernetics by Maxwell Maltz. I read his first book in the 60's. Go's hand in hand with S.H. 5 hrs 41 min.. Visualization techiques

":Since its publication in 1960, Dr. Maltz's seminal text has inspired more than 30 million readers to enhance their lives and achieve life-changing goals - from losing weight to excelling in sports to dramatically increasing their income. Now revised for a new millennium, The New Psycho-Cybernetics remains true to Dr. Maltz's visionary approach and proven groundbreaking techniques.
You'll meet actors, athletes, coaches, sports psychologists, sales professionals, executives, entrepreneurs, and many others whose lives were changed by putting into practice Dr. Maltz's incredible formula for success. Here is your path to a dynamic new self-image and self-esteem, and new dimensions of happiness and success. "

Great thing about this form is that you can listen on the way to work, or while you are walking/running, or execising.

Not the S.H., but listening to the books to learn about it.

http://www.audible.com/adbl/store/welcome.jsp