"Probably" is not "certainty". In my family we have no shortage of current and former EMS personnel, and we don't bother to have sutures in our big box of medical stuff. Most people are needle happy and it can turn a "may die" into a "will die" if you've never done this before (and reading about it doesn't count). In a "will die", sure, but those often involve more than "just" sewing.

Remember, a suture is a surgical procedure.