[pja]

[P.S. This is going to sound a little fluffy but it is absolutely true: one of the first steps is to stop saying "I am not a good public speaker" and start saying "Some of the speeches I have delivered have had a lot of umms in them", because that identifies a specific issue which can be fixed by an identifiable behavioral change, rather than solidifying an identity around features of past speeches you may have made.]

Not fluffy at all: this is a core part of Cognitive Behavioural Therapy (CBT) & it's very powerful.