I read Managing Humans twice, both before starting to manage a team, and after having managed a team for a year. The book was great both times, but the second time, when I had more experience, it was insanely better. Suddenly,
everything talked about in the book made sense - I had real-life people and situations straight out of the book, and I could understand exactly what Rands was saying.
My advice - read the book. It's amazingly accurate. Then read it again once you have experience; you'll be able to appreciate it a whole lot more.