It's best, I think, to do some sort of chant while doing the PhotoReading step, and it doesn't really seem to matter what you're saying while you're doing it, so long as you're doing it.
In the recent TeleSeminar, Pete has said he's done, "One, two, buckle my shoe, three, four, shut the door..." As long as you're relaxed and you're occupying that little conscious voice, that voice you can hear talking in your everyday thoughts - it really doesn't seem to matter.
-youngprer