Hi Sharon:
I agree it's possible to lead by example as long as the "leader" is organized and knowledgeable.
I know several contemporaries who could, on a moments notice, report to a classroom and speak for 2-3 hours on a topic related to my profession - and would dazzle the students with the information they presented. Nada on preparation (except maybe the years, education, and experience that preceded the speech)with well organized thoughts, sequential points, amazing vocabulary, and be ready to do it again an hour later.
Exceptional? Perhaps. I certainly don't want to convey or advocate that's the way to do it. I'm just saying our preparation, whether good or bad, will be evident. And I think you are syaing that too.
Regards, Barry