If you go through the excersizes too fast without mastering the previous excersize, that may cause injury according to my teacher, so maybe try taking a slow pace through the book to avoid injury. Mastering means going from 60 to 108 progressively, master the speed and making sure each note is distinctly heard. If you expirience pain on even the first excersize, maybe hannon isn't for you then. Just kind of regurjitating the things my teacher told me when she wanted to start me in Hannon. Klick