I've never gotten a clear explanation of the difference between confidence and arrogance, I mean, except as just a matter of degree. People tell me "well, that explains a lot about you" which, I'm sure, it does. but nobody seems to have an answer to the question that makes even a little sense.
As for "blowing up" what I mean is that you need to adjust the, ah "volume" or "intensity" of your feelings upwards, vs. managing a person who isn't very confident, in which case you want to seem very low key, especially when the shit hits the proverbial fan; as I was mentioning in a previous post, if your emotions seem too intense when there is a failure, you can inadvertently train your less-confident people to avoid risk more than you like.
I'm trying to say that more confident people will often ignore the less intense criticisms. they are more likely to assume everything is OK unless you make it very clear that it is not. If you try to be low key about it, a more confident person generally gets quite irritated, calling you "passive aggressive" (even if you are direct in a soft voice... it is the soft voice or soft framing, I think, that they find irritating.) and, well, getting quite irritated. My experience has been that an error on the side of too much emotional force usually has better results than an error on the side of not enough emotional force with the more confident sort of person.
The interesting thing, I think, is that you can almost say the exact same words to the two groups of people. Being direct is almost always a good thing. But with the two different groups, you need to frame it and communicate it very differently. Having an appropriate amount of emotional force behind your words is key, and that appropriate amount of emotional force varies quite a lot depending on what sort of person you are attempting to communicate with.
I'm approaching this problem from the perspective of someone who is naturally not all that aggressive, who has learned how to fake it, to some extent.
(and yeah, to tie this back to the article, one of the things I taught myself was to sit in a very relaxed and expansive way that takes up a lot of space. I got the idea because I read a lot of feminist literature as a youth, and that is one of the behaviours a particular author found irritating in men. "wow," I thought "I sit like a woman." because yeah, I tended to sit very compactly, to take up little space. So as I got older and tried to fake this confidence, I started to sit more, uh, expansively. To consciously take up more space than I needed to. It feels pretty natural now. The really funny thing about this is that other people are aware of it too. try putting your feet up on the table or otherwise visibly relax and take up more space while talking with a male who is of greater status. You will often notice them doing the same thing, sometimes to a ridiculous extent.)
so yeah, you are probably better at modulating your emotional force on the top end than I am, just 'cause that's not my natural state- that is something I learned. But my experience has been that even overdoing the emotional force by quite a bit usually results in more positive outcomes, when dealing with a confident person, than underdoing the emotional force, and looking like a wimp.
Really, though, I think the key to this emotional confidence is having that willingness to experiment, and to screw up. I have yelled at people (and yeah, it's almost always the wrong thing to do.) I've made people cry without really meaning to. I mean, it's not something I regularly do, and it's something I'll try not to do again, but for me it was part of this learning process.