I still don't know what it's like!! lol It doesn't start until Feb 21st, but she gets you to do some tasks over the next 4 weeks to get you in the right mind set for the challenge. There's not a whole lot of info around about the program so I just took the leap and signed up anyway. I've been browsing the forum and there are a lot of people who are back doing it again and have had great success, so hopefully that's a good sign!
As far as breastfeeding goes, they say it is safe to do the program. You just need to add an extra 500 calories daily to your diet.