What I understand from your post, Yukala is that the only way is to keep doing it, keep doing all the steps and wait for intuitions while activating?
Looking for proof on a personal level requires engaging in some activity that proves it to you. Not Photoreading itself but rather in applying the 'content' of that which was Photoread.
As in being lost in London and not a native English speaker or taking a test or building something after ONLY having Photoread the directions.
For a new language:
You need read, write and speak in that new language after you Photoread how to read, write and speak that new language. Are you using a translator from French to English right now here in this forum for instance? Using a translator will prove nothing for instance.
How can you know or prove without some kind of direct application that proves it? Intuition is only as good as it proves out by test of experience and logic, otherwise it is just speculation.
Any new skill is a 'what if' until it is not.