The only book I read about the process after awakening and up to existence on higher planes is "The Nine Freedoms" by Dr. George King, a western master of yoga.
Its a quite unknown book and master, maybe because it is too advanced and/or maybe because of the (some might call it cheesy) flying saucer-stuff in it.
Anyways, this one increased my spiritual striving tremendously, and cleared up alot of things and also triggered many new questions inside of me.
The synopsis of this book is, that selfless service is the supreme way to evolve upwards(whereever that is, ha
The one book you just wrote about, sounds very interesting as well.
Since so many people are waking up now, theres a great need for guidance on the path which is being given.
We were/are never left alone!