I suppose you don't. By the time you know a shitload in details and depth of some subject, you also know another shitload of related things that you know you d

I suppose you don't. By the time you know a shitload in details and depth of some subject, you also know another shitload of related things that you know you do not know yet, so you still keep considering yourself a half-newbie. And because you're interested in things you don't know, you rarely talk about the subject with people who know less than you, which distorts your field of vision. Indirectly, perhaps you could consider it a sign of an "expert" to have been so alienated from what is generally considered normal that people label you as a geek. But then again, you can never declare yourself an expert or you're just selling to be something you aren't.