Alright, I don't usually post, but I had to jump in on this as it is one of my favorite topics. I would say hold back as much as possible, and maybe even get to a safe location (but just barely) right before the sensation is overwhelmingly too much and I just have to let out a humongous blast. But the fun part is the holding-it-back build-up as the sneeze gets stronger and weaker and under control and slips out of control again. Extended buildups are great. As are those little comments, the "oh, no, don't sneeze! Hold it back! Oh nooooo!" bits. That's all 100% great in my book.