Think it through, then do something. Reflection without motion is just a very long pause.

Thinking can turn into a way of not starting. Planning produces the sensation of progress at no risk, which is exactly why it is so easy to stay there, refining an approach while nothing enters the world where it could fail. Past a certain point more consideration adds no accuracy. The information you need next only appears once you have moved.

Set a deadline on the thinking and make the first move imperfectly. Choose the smallest action that would produce real feedback. Keep reflecting afterwards, when there is something actual to reflect on.