If you’re scared then do it scared. Of course you’re gonna be nervous but that’s what having a stutter does lol. You’ll do well bro trust. Aside from that, advice to reduce is to breath and talk slower than usual. I like to break up my vowels, so let’s say I’ve gotta say the word ‘pray’ I’ll say ‘puh-ray’ in succession. Obviously can’t be done with every word but it does help. Lemme stress this again BREATH and breath deeply as well. Speak up and loud as well, istg if you fake confidence eventually it just turns into real confidence idk how that works but it does. Anyways that’s my advice. Good luck !