I found that being able to plan cold turkey to start on a Friday worked, with an option (but not obligation!) for a long-ish recreational activity that can be followed by a keto-friendly meal. I say optional on the recreation because the first time I did it, I decided to sleep through the sugar headaches for Saturday. A key point to remember is that willpower has some relation to dopamine, so if you are in environments during the hardest push where you have to refrain from so many other things you want, it may affect your sugar cravings--but on the other hand, you can plan healthier replacements.