"Congratulations" (melee anouncer)
Now, I think most of the stuff has been covered. Stay calm, mind your fundamentals and tech, and most of all have fun!
I got bodied in the first tournament I went to, It was a big tournament so I didn't make it out of pools (second to last place in pools, but socal lol). But it was one of the best experiences I've ever had while getting bodied XD. Everybody was really friendly and playing friendlies was really great. Also, seeing some pros in person is quite different than seeing them in a video.
Pew Pew U was there, M2k, Ken, and Hbox off the top of my head. (Hbox and M2k in doubles is freaking scary).
Everybody loves the game and that is why they are there. Having fun is the number 1 thing on any tournament list. Because if you aren't having fun, why are you there?