I used to feel kind of queasy when I first started photofocusing a large number of books. With practice I have grown to enjoy the process immensely. In fact, I find it highly relaxing.
You might find it useful to listen to tape 3 when you photoread. When I started out I used to bring my walkman to the bookstore and go through the whole process with Paul's help. By doing that in the beginning you will really get a feel for what a highly relaxed and productive photoreading session feels like. Then when you do the 3 to 1 method you will instantly go into state.
As far as activation techniques 'Direct Learning' is my favorite. I also 'Skitter' whole books if I am reading for recreation.