Don't look for techniques in this book - O'Connor's book is all about how not to make a fool of yourself in the dojo: how to find a dojo/teacher, how to bow and behave, how to make your most out of your training and how to care for your aikido uniform.
One would think this would be all self-explanatory, but unlike training in a gym where you get verbal pointers, martial arts dojo rarely give explanations on why you're doing what you're doing. In Japan, you follow the leader and you'll learn the finer points during your training. Western education is different and many Westerners flounder in the dojo, misunderstanding customs or trying to find a Western reference point. This book is like a translator sitting on your shoulder telling you why you need to do all the stuff that seems so mysterious to the first time beginner.
Recommended to beginning students of Aikido.