anxiety, stress & nerves help!!

I have a speech and debate class in which we debate & winners go against winners while those who lost the round just help the winner (paralegals) in their next. I won all of mine and am now going against a girl who did so too. we're the last people to debate & i am so nervous because she's intimidating af! a girl literally asked our teacher for an alternate assignment instead of going against her but was declined the offer. her last partner even told her "sorry, you make me nervous" & I want to know how I can confront her case. my friends told me they think ill win but I approach things nicely whereas she's more demanding (ig you could say) what can I do to help calm me down the day of & keep my cool?