Note that one of its foundations is that developing social, emotional, expressive, performance-based skills takes practice and rehearsal to go from mechanical practicing, like playing scales, to effortless, genuine, authentic self-expression. The same as in learning to act, sing, play an instrument, play a sport, military, and so on.
The book gives you exercises. It's not for everyone. Just reading it will help you appreciate the skills. Practice will lead to growth.