You don’t need to know all the answers. In fact, you’ll be better off if you don’t. You need to know the questions.
It’s rare for the person with the answers to just speak up. But if you know the questions to ask, you can prompt the people with the answers to share them with everyone else. And when they speak up, you know what to do, and they feel empowered.
The questions reveal the plan and process and people you need to move your idea forward. And since no one will ever have all the answers, it’s makes much more since to try to know all the questions.