I totally agree with this last point. When I stammer I’m always thinking about what other people are thinking, e.g. “What if they think I don’t know what I’m talking about?”, and these thoughts clutter up and just makes it harder to concentrate on what we are saying. However, by disclosing the fact you have a stammer - just as you would your name, or your age, eg I am a person who stammers so it may just take me a couple of seconds extra to get my words out - even though people already know this, it relieves a lot of tension that we have built up about other people’s perceptions! Best of luck!