Over-preparing can be fear wearing a lab coat. At some point, the notes have to become action.

Over-preparing looks responsible and can be avoidance in good clothing. There is a point where another article, another set of notes and another practice run stop improving the outcome and start postponing it, and that point comes earlier than most people expect. The tell is relief, because more preparing means not today.

Give the preparing a deadline the way you would give the task one. When it runs out, go with what you have. Afterward, check whether your final hour of getting ready changed anything you actually did.