I guess the big question would be why would you want to do this in the 1st place. If you're doing it for yourself, then that's okay. But if you're doing it for or to appease someone else, then I would recommend holding off.
It's definitely an enjoyable position but as it progresses, I find it difficult to concentrate on what I'm doing. And one always wants to do their very best at the task at hand (or mouth)!
