One must develop a habit. Training.
Distinguish between the things I can put off, and those [I cannot].
Begin the training with small things, those for which inspiration is useless…

Every day, do 2 or 3 things of no interest at some definitely appointed time.

Reach the point where punctuality is automatic and effortless. — Lack of flexibility of imagination. An obstacle to be methodically overcome. The second screen between reality and yourself. Much more difficult. What is needed is something quite different from a methodical training… But precious.