What does it mean that start smaller than you think necessary?

The starting version of a new habit should be trivially easy.

Example: You decide to start a daily journaling practice. You buy a beautiful leather notebook, set a thirty-minute block on your calendar, and commit to writing three full pages every morning. Day one is magnificent — you write four pages, you feel like a new person, you photograph the notebook and post it online. Day two you write two pages and feel slightly disappointed. Day three your alarm goes off and you lie in bed calculating whether you can afford thirty minutes before your first meeting. You cannot. You skip. Day four you skip again because you already missed a day and the streak is broken. By day seven the notebook sits on your nightstand collecting dust, a monument to ambition that outran execution. Contrast this with what B.J. Fogg would have prescribed: after you pour your morning coffee, open the notebook and write one sentence. Not one page. One sentence. That is the habit. Everything above one sentence is bonus.

Try this: Identify one habit you have tried and failed to establish in the past year. Write down the version you attempted — the full ambition. Now scale it down until it feels almost embarrassingly easy. If you tried to meditate for twenty minutes, your tiny version is one breath with your eyes closed. If you tried to exercise for an hour, your tiny version is putting on your running shoes. If you tried to read thirty pages a day, your tiny version is reading one paragraph. Commit to only the tiny version for the next seven days. Do not allow yourself to do more than double the tiny version on any given day, even if you feel motivated. Track completion with a simple checkmark. At the end of seven days, evaluate: did you complete all seven days? If yes, you have a habit anchor you can begin to expand.