This was super counterintuitive to me at first, especially given the importance and magnitude of the choice in front of this person. But over time, this point has led me out of internal deadlocks time and again.
It's not that the details don't matter; obviously they do. But decisions aren't difficult when there's an obvious best choice. They're hard when my mental pro-vs-con lists are well balanced against each other. No wonder it's difficult to think my way out of those dilemmas!
And in those times, being able to remind myself that the more difficult it is to decide, the less it matters, has saved me time, agony, indecision, and later, second-guessing.