Planning can become procrastination wearing a calendar.
A plan can give you a preview of accomplishment before any uncertain work begins. Rearranging steps feels orderly. Sending the draft invites a response you cannot control. It is understandable that the first activity sometimes expands to fill the day.
Planning has done enough when you know the next useful action and what would make it safe to try. Beyond that point, more detail may need evidence from doing. Let a small real attempt tell you something a more elaborate diagram cannot.
What information could you only get by trying the next step?