I've never subbed before, and I got a call today for a couple of assignments coming up in the next few weeks. I'm okay about handling elementary school, but I'm nervous about high school and middle school. Things have changed a lot since I've been in school, and I don't want to mess things up and not get called again....I've never been in a classroom setting, and keep visualizing, but discipline is where I keep coming up with a blank! HELP, PLEASE!!