Have you noticed that as the years go by, you're meaner, or maybe I'll say firmer than you used to be? I've been subbing for several yrs & had my own classroom for one year, but I notice that I'm the firmest I've ever been with the kids when they misbehave. I don't feel guilty about it. It shows me that I can stay on top of it because let's face it, kids are very bad & smart alecky these days. They need a good kick in the rear (not literally of course). I think it's normal & every teacher gets to that point where they have a system that works for them because they've seen it many times before.