How to survive if you are a junior business analyst?

It's hard to avoid mistakes and stress situations at the first place of work if you're a junior business analyst. Except patience, resoluteness and concentration skills it's useful to know some specific work aspects. They aren't connected with academic knowledge about business analysis, but they might be useful if you meet difficult situations. I propose to talk about the most common situations, which I had in my practice so that, I hope, will help junior business analyst survive in hard conditions of IT world.