That's sure a lot of children to practice on!
I don't have children or even many children around me. Most of what I know comes from having been a child! And observing parents with their children. So I'm not full of advice there. But I know a lot about anger and learning to control it has taken a lifetime! For me what works is noticing the anger building and taking that as a sign to stop and step back. Is this worth being angry over? Is there a different way to react than stabbing that person? ;-)
I had a little therapy about anger and one idea I liked was to go to a quiet place (my bedroom) and yell and pound on the bed or a pillow and let it out. A safe place to release tension. Maybe spend a few minutes feeling sorry for myself. Then get up and get on with the day!
A good stink eye is a skill worth having!