It was not easy but not hard. Just get liquids you like and keep track on the fridge of Calories. I was on a 1000 cal diet. I bought my shakes at Coscto and organic Soups in the box. I loved cream of tomato, Mushroom and onion. Nothing in them but liquid. Low fact v8 fruit juice, sugar free ice pops, crystal light cherry and some other stuff. I was allowed a lean cusisine under 300 calories ( included in the 1000 daily) on the third day until the sencond to last and last day before OP. Good Luck, I would suggest having one meal of a juicy steak and whatever you like as well before or 1 day in. I also quit smoking so It was hard for me but I did it and now I am 2 days out and soar but so positive for the outcome!! Good Luck and remember the end result.