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Exactly, trial and error. That's basically what it comes down to.

It felt very awkward using my left hand at first, but the more you use it, the more natural it feels. Now I'm as comfortable...

For a while, I was getting much better results on the right side of my face than my left. I'm also right handed. Coincidence?? I don't think so.... Doing the opposite side of the face definitely is...