In the words of Dora the Explorer, 'we did it!'. Day seven and no shouting. I'm so proud.
So, what's the moral of this story? My kids don't listen to me whether or not I yell at them. Just kidding. [Kind of.] If I really want to, I can discipline my kids without yelling. It may take a little longer, but I'm hoping that's just part of the learning curve. They're so sweet and so bright, I don't want them to remember their Mom as the crazy yelling parent. Totally uncool.