Buy the book.
That way you'll get fully acquainted with the system and see if it is for you.
Basically, you "photoread" which is going through the pages of a book quickly with a soft focus and in a mild trance state. The rest of the techniques involve various forms of "activation" and reading (more familiar to most people as skimming, speed reading, and normal reading).
Basically, the approach is to be flexible and goal oriented in your reading method. The photoreading stage is where you expose information to your mind at a rate faster than your conscious mind can comprehend. Comprehesion of certain parts pertaining to your goals comes from subsequent steps.
The "photoreading" step does not have to do with a photographic memory. The course does not teach you to have a photographic memory. It does not have to do with instantaeous comprehension of anything. It is simply providing information to the "preconscious processor" in the brain.
You could say that the term "photoreading" would be a bit of a misnomer and in my opinion you'd be right. But the technique has a lot to offer, so I'd suggest buying the book if you're curious.
The personal course goes much more in depth and helps you really explore each step and develop your skills in a deeper and broader fashion.