Ah yes. The study of habit surely goes back to the invention of the printing press and has influenced us all. After all, we attend school to learn habits beneficial to our civilization. We never really unlearn most of them and even our rebellion is usually in the form of a habit of laziness.
That much can be done by consciously changing a single habit is really the most important insight. Any such takes time best not ruined by attempting too much in dealing with several habits. Better a single change is reinforcing one's self esteem as well.
I use a habit of fasting Monday, Wednesday and Friday to sound and beneficial effect. I use Sunday morning to attend a one hour meditation. These are all planned habits that accomplish two things. It ingrains carefulness in what i eat and it encourages me to do additional meditation during the week.
We all have daily habit regimes. My 'habits' impose a superior regime over those daily habits.
The real take home is that self inspection will allow you take control as much as is desirable.
The lost hope of self-help
Habits – good or bad – were once a matter of ethical seriousness. Are they now just another technology of self-absorption?
Habit is … the enormous fly-wheel of society, its most precious conservative agent. It alone is what keeps us all within the bounds of ordinance, and saves the children of fortune from the envious uprisings of the poor. It alone prevents the hardest and most repulsive walks of life from being deserted by those brought up to tread therein. It keeps the fisherman and the deck-hand at sea through the winter; it holds the miner in his darkness, and nails the countryman to his log-cabin and his lonely farm through all the months of snow; it protects us from invasion by the natives of the desert and the frozen zone. It dooms us all to fight out the battle of life upon the lines of our nurture or our early choice, and to make the best of a pursuit that disagrees, because there is no other for which we are fitted, and it is too late to begin again. It keeps different social strata from mixing. Already at the age of twenty-five you see the professional mannerism settling down on the young commercial traveller, on the young doctor, on the young minister, on the young counsellor-at-law. You see the little lines of cleavage running through the character, the tricks of thought, the prejudices … from which the man can … [not] escape. On the whole, it is best he should not escape. It is well for the world that in most of us, by the age of thirty, the character has set like plaster, and will never soften again.