Public speaking has never been a problem for me. Many years of treading the AmDram boards has hardened my skin to the inevitable failures of technology, programme or other facilities which beset even the best organised of conferences.
Of course, the vast majority of presentation takes place in much smaller groups with a much more specific purpose, nevertheless the basic tenets of presentation remain the same:


How effective has my presenting been? Were I so inclined I could speak several times a month at a conference level. At an operational level the success of my delivery can only be reflected in my success at winning business throughout my career.