I think they are primarily suggesting that you take it slow.
I'd wager a lot that your craving was due to the psychology of the process you performed, not some actual physiological withdrawal. If you took your time and found other things that were good to eat, rather than 'quitting' your habitual foods, I don't imagine you would have any trouble at all.
I was eating vegan burgers every so often. That should've covered the psychology aspect, but it didn't.
My energy level was steadily declining, as you might expect for an iron deficiency. When I gave in and started eating burgers, they were profoundly tasty, and my energy levels recovered.
I've had dietary shifts in the past (from one omnivore diet to another) and nothing like this happened.
I'm on board with the ethical aspect of veganism. I'm annoyed by what I perceive as the ideological aspect, which pretends a vegan diet can easily be perfectly nutritious.
[I'm complaining about this because I'm hoping vegans will take a hard look in the mirror, and start taking nutrition seriously, so I won't suffer from an iron deficiency (or whatever it was!) if I try again in the future.]
I'd wager a lot that your craving was due to the psychology of the process you performed, not some actual physiological withdrawal. If you took your time and found other things that were good to eat, rather than 'quitting' your habitual foods, I don't imagine you would have any trouble at all.