There’s usually a lot of downtime at tournaments, bring a book, or watch the matches of the better players. I usually bring my own food to tournaments b/c i’m cheap, but if its in a bar they’ll probably not let you do that. As for the tournament jitters, those go away if you go to enough tournaments. After you get eliminated, you could always talk to the people at the tournament, they’re usually not douchebags. expect it to be an all day thing, though. and tournaments almost never start on time. Get to the venue early, though, to get used to the timing of the screens b/c they may not be the same screens that you are used to playing on.
omfg my first tournament was terrible i went 0-2, left early, so salty. But, y’know, I ran it back, kept playing with people, sat in training mode trying to figure shit out, and I’ve never gone 0-2 since then.