Similarly, before I started teaching, I subbed for a year. One day, and one day only, I subbed for a kindergarten class. All I did was tell a kid no. I didn't yell, I wasn't as direct as I am with some of these idiot eighth graders, I was just ...no. Alligator tears! That one day was enough for me.
As far as coaching, I've been coaching boys soccer for a billion years, like that lying old tramp on Titanic. Girls? 50+, you're a better man than I am. For exactly what you mentioned.