Since Frankie Boyle's departure last year, Jones has sat alongside regular Hugh Dennis and another guest.
He told PA: "As a guest, it feels really awkward to interrupt, because it just seems a bit rude really."
He went on: "Also, when you first go on, you don't know your way around and when you have to stand up and sit down. They do say, 'Don't worry, you're there to do your own stand-uppy bits and don't feel you need to talk across people'.
"But the trouble is, the longer you leave it when you don't speak, the more tension you create when you do speak, because it better be really funny this time!"
Jones added: "You feel a pressure to say your piece and yet you've got to try and look like you're enjoying it at the same time, so it's the ultimate acting skill. There are people who refuse to do it."
Mock The Week returns for a new series on Thursday at 9pm on BBC Two.