Go for it!!!
I did a 5 day fast last month to get a baseline on what my body needed, how it responded, etc. It was such an amazing experience and am looking forward to a longer one starting after Labor Day.
A couple of things that I found helpful (take with a grain of salt...no pun intended!)
The forum is amazing for keeping you going. Much like someone who needs a "fix," I found myself running to the board to get advice whenever I felt weak.
I also had a hard time with mixing the cayenne in the lemonade and took away from enjoying it. I ended up drinking a "shot" of it with a little lemonade right before I drank the rest, cayenne-free. Made it much more enjoyable.
Listen to your body--I think you find how amazingly fast it responds to what you are doing. I was up at 7 each morning, bouncing around....and anyone who knows me, knows this is truly a miracle!
Good luck to you, enjoy your experience, and read as much as possible, even previous posts. I found I could always find something relevant to what I was going through.