For Direct Learning you use no less than five books as instructed in the course.
You'll always previewed books to find out it they will suit your subject. The preview is very light, maybe 30 seconds each.
You have selected the books for a specific purpose, whatever reason you are doing the Direct Learning on, that is what you envision yourself using in your timeline. You need an idea, what you are PhotoReading the books for in the first place. Use that in your timeline imageries.
You watch what happens for the next 30 days after PhotoReading and doing the timeline. You may find that someone notices your changes before you do.
If you don't get the result you want, select another ffive books on the subject and try it again.
Alex