I do a lot of public speaking, presenting and demoing to audiences of various sizes, and am considered (by at least some people) quite good at this stuff.<p>My advice would be just stop and think when you need to. It&#x27;s completely fine and you will convey the impression that you are a serious and thoughtful individual, which is good.  You can show that you were listening and are about to respond entirely through your body language.<p>If you feel uncomfortable with that, there are a bunch of simple tricks you can use here and saying &quot;umm...&quot; is not a good one.  One easy thing is to always ensure you have a glass&#x2F;bottle of water.  If someone asks a tough question and you need time to think, wait until they have finished their question, then take a drink of water.  No-one thinks this is even slightly strange and it gives you time to think and make a considered answer.