Choose once the evidence is sufficient; perfection will not sign off.

There is a point where more research stops improving the decision and starts protecting you from making one. Perfection never issues an approval, so waiting for it is waiting for something that does not arrive. Sufficiency is the standard you actually have available.

Decide in advance what evidence would be enough, then honour that threshold when you reach it. Notice the urge to gather one more data point past that line and treat it as anxiety rather than diligence. You are allowed to act on enough.