In my opinion, best not to try to study お type honorific phrases out of the book. The few times you do end up saying them, you will probably have simply learned お as part of the word, like おさけ, ごはん, and ごちそうさま. Since both を and ご prefix different words, and those words are set, not by any real set of reasons, but just through usage, you're better off waiting until you come to Japan and learning which prefix to attach to which word by hearing them a million times.
ie: 少々お待ち下さい = Please wait a moment.
shoushou omatchikudasai
ご案内申し上げます= Let me guide you (this way) (I think?)
goannai moushiagemasu
Even when you learn them, you'll probably never use them...