I remind myself that there is so much written about aviation, that you can always look it up somewhere. The key is to know where to look it up, as correctly mentioned, and to know when you should not have to. Certain things are very certainly memory items. If you don't know a memory item, it's important that when you do find the answer, it gets memorized. It does not matter what kind of pilot you are.
A good pilot character trait is an appropriate measure of self confidence. The ability to admit that you don't know, and will find out is a good indicator of self confidence