No preparation to speak of. Quitting for me was kind of like washing up on a deserted island. In the beginning, I had no infrastructure, no point of reference, no idea what to do. Luckily I was reading here on SR, so I figured it out pretty quickly, and each day I added a little more to my sober routine.
Also, I've found any fitness goal you have is eminently more achievable if you quit entirely.
The only thing left to do is to do it
