From his education the lawyer learns what the law is. He may not be able to cite to the specific authority but it's there, he has seen it.
The lawyer's experience in practice gives him the not infallible ability to know what the law should be on an unfamiliar point. He then must research the law to see if what the law should be is what the law is. It is a time intensive task. How much research is enough research? What if I am wrong? How much time do I spend looking?
When he is not wrong and after hours of research and accumulating doubt such that he almost gives up he finds THE CASE the lawyer experiences a Eureka! moment.
The lawyer's experience in practice gives him the not infallible ability to know what the law should be on an unfamiliar point. He then must research the law to see if what the law should be is what the law is. It is a time intensive task. How much research is enough research? What if I am wrong? How much time do I spend looking?
When he is not wrong and after hours of research and accumulating doubt such that he almost gives up he finds THE CASE the lawyer experiences a Eureka! moment.