My experience in giving talks doesn't really compare, as I am but a lowly sister, only ever allowed to be on the school. However, when I did give a talk I would try to do something to make it more interesting. I never felt I needed practice, as giving presentations and trainings (which I created and was responsible for) was part of my job, which I enjoyed, and I did it all the time. Giving a little six minute spiel didn't compare.
Anyway, the last talk I gave I rearranged the order of the information because it was just awkward the way it was listed in the source book. It's very hard to give a talk with no logical progression - I'm sure you guys would agree - so I rearranged it to make it flow better. I got quite the scolding from the brother giving counsel. This was 12 years ago, and after that I never gave another talk, nor did I accept a last minute assignment (from the same brother) like I used to.
The whole thing just was ridiculous.
But I can tell you, the rank and file really do appreciate a talk that's given authentically from a brother who cares - versus the scripted stuff they require now. I can remember as a teenager how some of my favorite brothers would give talks really from the heart, and you got a lot out of them. Not any more - people are half asleep at the meetings, it is so boring.