txtina, Some people just go right into the Master-Cleanse without any preparation. I suggest if you eat alot of Sugar and or coffee you should try to stop it before going onto the cleanse....it's hard enough being on the cleanse then having headaches from coffee/sugar withdrawl makes it even harder.
tleighj, I did a 5 day juice fast last year and I did raw veggies/fruits for 3 days prior to switching to only juice and I transitioned wonderfully.