As a potentially not-helpful aside, I'd recommend trying to get as much actual reading (as opposed to skimming) in before your session as possible. I've read through the rules a few times, been following them for the last few months, talking on these forums about them rabidly, et cetera, and yet when I ran it the first time (also the first time I played in person, eek!) I felt unprepared!
I would also recommend printing out the first session sheet (looking at it on your laptop is not as good) and making some 'cheat sheets' with your principles and moves on them, as that was my main issue. The players have most of the moves they need right there on their playbook/sheet, so you as the MC mostly want to pay attention to the principles and moves, and since I haven't totally internalized them yet (much less making them happen easily) I find having them there to remind me "oh yeah, I can do this awesome thing!' helpful.
All that being said, I'm sure you'll do great, even struggling to "do it right" my players said they had a great time and can't wait to play again.