The best leaders know what they need to pay attention to. You cannot know everything. You can know any one thing (or perhaps several), but there are more things to know than you will have time to learn in your lifetime. The question is what is important for you to know, and what you leave to somebody else.

You will have to trust someone will figure out the details and come up with a reasonable solution. Sometimes you need to know that solution, sometimes in detail, sometimes just enough to know that they solved it. Sometimes you are the person who needs to figure out the details and make the solution. Knowing which you are is important.