The Juice Fast

I've decided to try a juice fast/ diet. My friend Mark has had some success changing his lifestyle doing one and now it's my turn. During the fast, I'll only partake of vegetable and fruit juices that I'll make myself and lot's of water. After the fast is over, I will, in theory, switch over to a better way of eating. I think, initially, the hardest part will be kicking the caffeine addiction, as I love my sweet tea.
I started today at lunch. I'm 293 pounds right now and am hoping for the best. It should be, at the very least, an experience.