In a word? Yes.
In other words, if you want to set your expectations appropriately, the truth is that it will probably take you anywhere from two months to eight months to build a new behavior into your life — not 21 days.
First, make a decision Decide clearly that you are going to begin acting in a specific way 100% of the time, whenever that that behavior is required. For example, if you decide to arise early and exercise each morning, set your clock for a specific time, and when the alarm goes off, immediately get up, put on your exercise clothes and begin your exercise session.
Second, never allow an exception to your new habit pattern during the formative stages. Don’t make excuses or rationalizations. Don’t let yourself off the hook. If you resolve to get up at 6:00 AM each morning, discipline yourself to get up at 6:00 AM, every single morning until this becomes automatic.
Third, tell others that you are going to begin practicing a particular behavior. It is amazing how much more disciplined and determined you will become when you know that others are watching you to see if you have the willpower to follow through on your resolution.
Fourth, visualize yourself performing or behaving in a particular way in a particular situation. The more often you visualize and imagine yourself acting as if you already had the new habit, the more rapidly this new behavior will be accepted by your subconscious mind and become automatic.
Fifth, create an affirmation that you repeat over and over to yourself. This repetition dramatically increases the speed at which you develop the new habit. For example, you can say something like; “I get up and get going immediately at 6:00 AM each morning!” Repeat these words the last thing before you fall asleep. In most cases, you will automatically wake up minutes before the alarm clock goes off, and soon you will need no alarm clock at all.
Sixth, resolve to persist in the new behavior until it is so automatic and easy that you actually feel uncomfortable when you do not do what you have decided to do.
Seventh, and most important, give yourself a reward of some kind for practicing in the new behavior. Each time you reward yourself, you reaffirm and reinforce the behavior. Soon you begin to associate, at an unconscious level, the pleasure of the reward with the behavior. You set up your own force field of positive consequences that you unconsciously look forward to as the result of engaging in the behavior or habit that you have decided upon.