When I presented for work I would always just try to focus on the content, and what I wanted to say. My downfall comes from being in my head saying “ok don’t stutter”. Every time I get in my head I stutter pretty bad. I found that if I can focus on the content and what I wanted to say I didn’t stutter as much and sometimes speak fluently. I know that’s easier said than done but that’s about my only advice. Good luck, you’ll do fine!