I see you have a 1200 standard live rating (the 1300 blitz being only after 1 game). This means you aren't a neophyte to chess. This is about the strength I was in my fist few tournaments. I'd usually come out with an even score (win as many as I lost and draw the rest) because you're able to enter in sections. I did play in a small local tourney with only an open section and won a few, lost a few.
If you played in the open section of a big tournament expect to lose every game 
paid teh USCF chess fee.
how badly should i expect to be destroyed my first rated OTB match?