I'm in a new role, supervisory level as I've got many years of experience.
2 people report to me daily.
I'm good at what I do and pretty decent at training others I think but I'm a bit of a flapper and I can be a bit highly strung and easily upset when I make small errors.
I do my best to hide this and always have done reasonably well (I think), but it comes out sometimes in day to day minor mistakes and even just the way I talk. I also stammer sometimes and I look like a fool.
How do I stay authoritative, calm , rational at work? What do others do to not get stressed?