One of the most common habits which detract from a good presentation (whether delivering a formal presentation or in some kind of formal talk) is the erm count.
I’m sure that you have been listening to someone speak and been distracted by the ums, ers, erms and um-ers from the person who is talking.at you
A simple remedy is to buy a rubber wristband. Every time you say an erm, pull back the wristband and let it slap you. The shock will rapidly make you aware of your erm count and help you to eliminate it.
The other good thing is that, if you buy a charity wristband, you are doing it for a good cause! If you can’t afford a wristband, a rubber band will do!