IANAGI, but I would almost think it would be easier to teach/learn if either the student or the instructor was opposite handed, as it would mean the guitars mirror each other when you are facing each other. So your fretting hands are side by side, as is your strumming hand.
At the very least, its not like you would be trying to learn to play with your toes, it can't be that hard to teach a lefty...can it?
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-Scott
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