Just make sure the doctor numbs both sides. It's a heck of a thing to finish the first and start on the second and think, "HOLY #$&^ I feel that!!!" I am quite happy about how low key I was able to play it off to the doc however. "Hmm," I said, "I really can feel that." His reaction was a bit more severe, "You FELT that?!?! Uh, I'm going to give you another shot and try again in five minutes." "Okay doc, sounds good." It is undoubtedly this exchange which led him to comment to my wife afterwards, "Here is a prescription for Vicodin, but you probably won't need it as he has a very high pain tolerance." Really?!?!? Not sure how tolerant I would be of it happening again. YIKES!