Tis' a fine line! I throw in plenty of humble statements as I like to think the only thing I really know is that I know nothing (though this makes me want to learn more, question more). I also throw in bits and pieces of random things I've studied and hope the other person doesn't just find it interesting for a moment but rather goes home thinking about it. Of course, possible they don't find it interesting at all and just think I'm a wanker.
Indeed it is a fine line, but there is plenty of things you can learn along the way to make that line a little less fine until it gets to the point that the line might not even exist anymore!
Give yourself some credit, you know stuff, and you can know even more if you want to :-)
That is what self growth is all about after all!
I find that having an understanding of human psychology is a critical step towards being effective with this kind of stuff, because it helps you work through the psychology of other people for a common goal (ie, a random conversation with a stranger, job interview, speech, etc).
Without it, your flying blind. When I was younger and flying blind it cost me a number of futures I will never see now.
Humbleness can come off as exploitable and dumb, just as much as it can come off as being intelligent, it's not just what you say, it's also how you say it!
