You can excel at accounting in a number of ways.
If you go into a field where you are an expert in law or accounting conventions, like taxes or public accounting, then you can excel by accumulating knowledge. Usually you have a good base knowledge of the issues in volved, but you don't ahve every single fact memorized. You don't know every tax law, but you know the concepts of taxation and know when you need to research something, and where to go
There is a lot of pressure to know everything, so if you are insecure about that type of thing, you might avoid public accounting or taxes.