I did this a couple of years ago, and plan on starting up again.
Now, before you begin, keep one thing in mind- you will lose INCHES, not pounds. My scale hardly moved at all, I think I was down only ten pounds after 6 months (and I have a lot to lose), BUT- I went from a size 24 to a size 16 in that time.
I don't know how or why it works, but it does. Still, if you're looking to lose weight on the scale, don't get your hopes up. It's all inches, but it sure is great when you try on new clothes and fit in them, no matter what your weight is.
By the way, make sure you are breathing right- that is VERY important. When my co-worker and I first started out, she was losing inches left and right, while I lost very little. She watched me breathing one night and realized I wasn't doing it properly- watch the intro Breathing tape several times and make sure you are doing it correctly.
You need to do this daily for it to work. I used the Advanced Body Flex after a few weeks, as it was only five minutes a day. Sometimes, I did that several times a day, it was faster and easier!