Good luck! I don't know anything about UF or its chapters (though I am of course biased towards a particular one). However, I'm sure you will do just fine, sophomore and all. Also, legacies count for less each year, it seems, as sororities care more about finding girls that "fit" with them.
I do recommend checking the chapters' websites if available, and the national orgs' sites if not! It'll help provide you with some background info that'll also help you keep the houses straight.
Anywho, relax, be yourself, and don't sweat the small stuff.
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