Epidural & Tearing

Ava
Okay so my plan is to go all natural but I am a little nervous that I won't make it. I don't want to be tempted with the epidural but was just wondering when is the absolute last moment you can get it? Cause if I pass that mark I know I don't have a choice but to go through it all natural. 
Also, if you are to tear during delivery without an epidural when they stitch you up do they numb you?