In my experience 95% people understand on the first 1-2 stutters that’s natural and not that you’re overly panicked. But telling them explicitly beforehand could 1. Show them you are self-aware and acknowledging your weaknesses. 2. Would lower your anxiety of not knowing at which point you’ll stutter and implicitly inform them. Also in general it would make you more confident. It’s just an obstacle you have and you just have to push through it.