This one is thanx to Liora. Rather, I will say "inspired" just in case I misunderstood.
Before you start a statement, do you know how it will end? If you do, do you know the words, or just the idea? If you know the idea, how about justification of the idea?
For a while I've known (think it was pointed out to me) that when someone says "um" (or the non-USian equivalent) it is because of a buffer underrun. So, the obvious workaround is to speak more slowly. Or do a Clinton (bite bottom lip) or similar (clasp hands, look down) to (fake) show concern as the matters actually "sinks in".
I don't think I know how it will end. I just know the basic idea. I also throw in justifications where I deem necessary. But, I'm not even sure that's so clear. I've got to think about it some more.