Earlier quoted context omitted.
I will say this in the spirit of somebody who started competitive public speaking as therapy to overcome a speech disorder which would have been virtually disabling professionally: you can hack your way through hesitation noises. A lot of the HN comments suggesting practical ways to do so would be effective. ("Speak slower" and "Use the air gap for a dramatic pause" are my two favorites.) Practice plus directed effor…
I second this. I used to um and ahh very badly and I started debating in school partly to try and stop myself doing this. I had a teacher use one of the most amazingly effective techniques to help me - she filmed me once as I read my prepared debate 'speech' (filled with ums and ahhs), and then filmed me a second time, this time telling me to consciously be aware of the umming and pause before I did, gather my though…
As long as we're on the subject of hacks: pick three people in the audience: one on the left, one in the right, and one a bit off center in the middle. Always make eye contact with them when you are speaking. Rotate every couple of sentences. BAM, perceived confidence goes way up.