Hey Gokul,
1)Yes, it doesn't make a difference, as long as you understand it.
2)I find that my conscious mind wanders a lot while photoreading. To get rid of this, I try to notice the patterns of white spaces around all the paragraphs and words on the pages.
3)Make it second nature. Use photoreading skills on everything you read, whether it just be super reading and dipping an article, photoreading 5-10 books a day, or even photoreading and activating between 1 and 5 books a day. If you make it natural, you will notice greater results.
-JackTuff13