I am about to start mine, I know I will need a lot of discipline to go through it. I have done it before and by God's grace I can do it again. I lost almost 20kg (94kg to 76kg) in 2007 and was able to maintain my weight for over a year. Although I stopped exercising, I still maintained my diet plan and my weight. But once I stopped the diet I started piling on the weight again.