Good luck with it.
I usually recommend the gradual transition by phasing in and phasing out a few things at a time, but some like to jump into the icewater at the deep end, each to their own.
I hope you go well, but you will be one of very few who don't fall of the wagon at some point, it may be a week, it may be a year, my point is if this happens to you, don't stress over it, it's all good, just dust yourself down and move on. The Stress factors involved in cravings/denial then post retribution/guilt etc aren't all that healthy, so let it go and move on.
i just had an episode over xmas, it wasn't so much falling off as making a choice to jump off and eat crap for a while, it was just a little easier in the social context, but I did pay for it, all up with clearing it out of the system was probably six weeks of feeling NQR, even there was only about 3 weeks indiscretion, back on the wagon now and will probably not be so keen to jump off in the future.