I honestly thought I'd never find myself flying on VATsim, but here I am now with maybe a dozen flights under my "belt" and starting to feel somewhat confident though still haven't completely mastered IFR readbacks. I am often surprised I get a "readback correct", when I shortly realize I left out on piece of info. All the controllers I've run into have been forgiving and helpful and I actually like occasional the terse/stern sounding voice, makes things feel more real. There is something about being one of a handful even of pilots at an airport with several active frequencies and getting thin