Some may think your question odd, but having started the book myself I think I understand what you are saying…or asking.
We are all on different plateaus of our spiritual journey and what is right for one of us may very well be too much for the next. This book, as you noticed in only a few pages, is very profound. The truth Gurnall exposes can easily knock you over; I was staggered by certain passages for days.
You mentioned being ready. I don’t know what you are ready for and if you are at a place in which God can speak to you though this book. You will have to let us know the answer to this question. I have read some books that really didn't speak to me...a year later it blew me away.
I will say that I think some Christians never advance far enough in their walk to be able to glean much from this book. I will be reading it at times for the rest of my days and will probably never truly gain all this book has to offer. It really is heavy…so to speak.
As for Gurnall’s method used I’m not smart enough to say. But I can say he was guided by the Holy Spirit, and what ever else method he employed worked well.
When I first started reading some of the older and more profound classic Christian books I wondered how they did it. There is nothing being written like it today…why?
I think it is because we cannot go back in time. A time with no CNN and Court TV. A time without cell phones and microwaves. No sports gods/idols.
These writers of old did not have the massive distractions we are faced with today, and it shows in their writing. They can say more in one sentence then many modern day Christians can say in a chapter.