Babies aren't particularly breakable, and the diaper terror recedes after the first poop. :)

And also, FWIW, I found labor much more a pain to be quiet about rather than to yell about. And you will, I swear to God, be *fine*. It sucks, but it is in fact transitory, and it is *totally unlike* any other pain I have ever experienced in that the *instant* the kid comes out, it goes away. It just goes away. Poof. You're sore afterward, but that's pretty ordinary musculature soreness: the big pain is just gone. All gone. It's awesome. :)