If you want to see how reinhardt played, check him out on youtube and watch. He uses two fingers.

There are no short cuts to getting good at the guitar.

It is hard work however you do it.

There is a reason why left handers play left handed and right handers play right handed. If it wasn't easier and more practical to play the appropriate way, then we'd all play right handed as there would be no need to turn guitars around and restring them for left handers.

I generally play the hard stuff with 3 fingers as that is how I taught my self to do it many years ago and it stuck.

I also lost the tip of my middle finger on my right hand which has affected my finger picking.

Which begs the question, what style are we talking about learning here? if your friend wants to pick out the tune with the thumb strumming out a rhythm then playing left handed won't help (assuming it has the coordination in the first place being the wrong hand)

Messing with tunings and turning the guitar around and all that just closes doors.

Its just one finger - don't worry about it - use what you have and stay in standard tuning until you're good enough to mess around and stay right handed.

ok?

ok. ;-)