Tiny Habits: The Small Changes That Change Everything

Tiny Habits by BJ Fogg might be a better book for you. The key to building habits is to start with a habit that is ridiculously small and once you feel like you've got that locked in, you can add another ridiculously small habit on top of it. e.g. To build a flossing habit, floss just one tooth a day. Once you've got into the habit of pulling out floss and flossing just one tooth, you can move onto flossing two teeth and so on. If at any point you feel resistance to doing the bigger habit you're trying to build up, you can always revert back to doing the initial tiny habit of flossing just one tooth.