To be fair, though, he is writing it for people who want to get into the field, and you can't become an expert without getting into the field first. (Well, you

To be fair, though, he is writing it for people who want to get into the field, and you can't become an expert without getting into the field first. (Well, you can, but it requires dedicating a lot of time and energy to it, more than most people are willing to give up after the normal day job.)