Teaching others how to replicate solutions is very different from guiding people how to solve yet unsolved problems in the field.
This book is for the latter. For the former, you might want to look out for one in the "for dummies" series.
My guy I learned this material from a healthy mix of ESL and Casella Berger and Billingsley. I could still, to this day, probably do every proof in this book without reviewing the material. And yet, despite all that training, I still argue this book is not useful for absolutely anything except assigning homework problems and setting exams.