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I got a dulled GD to practice with and went so far as to lather up. Still lather up for a little left hand practice. Doing this on a couple of unshaved cow lick like areas helped get a better feel for which direction the razor 'has' to move. Especially full face shaving.
Shave the lather not your face is the best advice I've received. ;)
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my first shave was just my good hand, since then I have been training to use my off hand, not as comfortable and a little slower but I do think its beneficial to use both...