During my first year of teaching I decided to quit seven times. I even told the assistant principal one of those times that I quit. He told me to go home and think about it over the weekend before I made it official. I changed my mind. My teaching career was that close to ending a few months into it.
I was so stressed out that I couldn't sleep on school nights. So I did the only thing that I could think of to help me through such a tough situation--I prayed.
I had not been very serious about church, faith, etc. for long at the time, but that first year definitely got my attention. Praying and going to church got me through it.
I don't know how anyone can survive as a teacher without having similar help. The job is that hard. Experience helps, but it doesn't solve everything.
Just like any of these tips, feel free to disagree with this one. You wouldn't catch me going anywhere near the teaching profession without it, though. You can count on that.