Usually a bit suspicious about Self-help Books. This was rec by a friend who does a lot of performance coaching. It is easy to read but most importantly for me it has several really good strategies for public speaking/self-image and voice projection that make sense and are easy to put into practice. The contributors are amazingly honest and generous with advice i.e. Major Hollywood Stars revealing their performance vulnerabilities and personal techniques to overcome them. Caroline Goyder is a highly regarded performance coach and this is a great place to start if you want to redefine your life for the better.