Right..so play this out for me. My current razor has two identical sides: side A and Side B. The 'with the grain' stroke on my left side cheek is done with Side A, using my right hand. The "ATG" is done using side my side B, with right hand. If I wanted to use side A for both, I'd have to use my left hand for the ATG stroke, which would make my fist run into my ear...or something.
This is what I don't understand. I think I know how a barber would do it...but doing it to myself seems like Yoga or something.