Two important things missing:

1) You will have technicians working for you that will earn more than you do. They will often act like prima donnas.

2) ( Advice given by a friend that was an IC, then a manager, then an IC again ): “They nip at you from the top, and they nip at you from the bottom.” Meaning that your manager will gripe at you, as well as the people under you griping at you.