I've taught my first three classes now and I think it's fair to say that it went quite well. Maybe I'll have more trouble maintaining order later in the year when students are more comfortable, but so far, it's been fine.
Also, I've talked a bit to other computer science teachers and the preparation that they get away with is almost shocking. Some of them don't even seem to think through the lesson at all; they just download a bunch of exercises and then conduct the class almost on the fly. I think if you just teach computer science and do it like that, you can have a pretty absurd hourly wage.
I'm doing 10 hours a week because it's only meant to be a side job, but honestly I could do thirty without too much trouble. And that is kind of ridiculous.
It's especially unfair if you compare it to (in my case) German teachers who have more work to do preparing classes, a harder time maintaining authority, and have to spend hours upon hours grading essays, all for I think identical pay. Similar but less extreme for foreign languages.