Maybe due to my little lad (or perhaps a drunken fool

Having never attempted this before, I was hoping for a bit of insight into the best way of doing this. The last thing I want to do is make matters worse

Here are a few questions I have:-
1. Is Novus 3 the best one for the job? I note that it is the most abrasive. Would Novus 2 be better advised for scratches not so deep? (I don't feel them with my nail)
2. Should I be using a sander at all?
3. Can someone point me in the direction of a good car buffer for the job?
4. Is there an indication when the anti reflective coating has been removed and will I scratch the glass if I go beyond this?
5. What is the best technique to use (slow in circles / hard as hell etc

Cheers,
Dave