I think you are correct, I would add that by nature it seems kids model their behavior after their parents somewhat automatically.
I've turned my family around from some pretty bad behavior simply by changing how I act. If they don't change automatically to follow, I may have to point out the change I made, and that I expect them to as well.
Or, rather, the actual most important “technical skill to get your kids to behave”, in the long term view is modelling the behavior you want to see.