"The most important habit is choosing the right habit to work on."
It sounds good, but it falls short.
In my estimation, the most important habit is to begin every day with the resolve to work on your habits, and to do that, you open your EZchecklist™ and start checking off the habits as you do them.
EZchecklist™ is "the mother of all good habits". If you start your day this way, and check in on your EZchecklist™ a couple of times during the day, and one last time before bed, you will surely build bulletproof habits quickly.