When you make a mistake, give yourself 30 seconds of regret. Take a time-out. Feel miserable. Berate yourself. Beat yourself up. Say all the horrible things to yourself that you want to say - only, you know, do it silently in your head so you don't scare the people sitting next to you.
Once she taught it to me, I got much better at dealing with and moving on from my mistakes. I wasn't wasting a week, or even a day, when I messed something up.
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