Before you start a practice that needs a pen and paper, have the pen and paper. It sounds too small to matter and it is the difference between doing the exercise and daydreaming about it.

What the research says

In a laboratory experiment, people who had just done a task that drained their self control drank more alcohol when it was freely available, showing that what is within reach shapes behaviour most when capacity is low. The environment does some of the work either way, for you or against you. It was a single lab study about drinking, so treat it as a reason to arrange things in advance rather than proof about any particular habit.

Strength of evidence: one line of research. A single study, or a theoretical account.