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This is because you're often more careful and use pressure when shaving with your non-dominant hand.

Its much less difficult to learn to use your non-dominant hand than you might think.

If...

Nope - the sooner you learn to use your non-dominant hand, the better off you'll be.

Sorry to be so blunt, but the truth hurts:D

Not a big deal at all - I find length more of a factor than width.

IMHO, 6/8 is a great combination of width, stiffness and maneuverability and is my favourite size.