The last couple of challenges look rather like Toddler Central, admittedly, but not everyone is good at speaking publicly and well. Even those who speak for a living do not always tailor what they say (or how they say it) to their particular audience. Not that I think that lwayers are prone to the latter or anything….
Trying out different approaches is useful, but this is best not done in front of your most important clients. There are training courses available (not really something that we do) but there are also more informal ways. Toastmasters International have branches throughout the country (and, of course, internationally). An alternative is POWERtalk International, who again have branches internationally.
Decide which approach works best for you in terms of time and money expended, but take up the challenge. You will be a better leader, manager and professional.