I just started (like REALLY JUST started) and this is all good information.. I think once I get a few more under my belt, I may try to do something thats not in the middle. :-)
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I mostly start from upper left. Sometimes (but its very rarely) I start from the middle. Its kinda weird for me, because I used to my upper left. Why I prefer this way? Because I dont touch parts which are already made.
And when I start from middle, I have this weird feeling that Im destroying my beautiful crosses with my fingers.