Wait - I thought this was supposed to be hard.
After offering Wendy the chance to go potty 3 different times over the weekend, with success each time, today we began in earnest. She was completely on board with the decision, asking for her "patties" (panties) after I took off her night diaper.
She has successfully used the potty 5 times today.
She has initiated the potty use each time, even interrupting her play.
She has not had any accidents. At all.
She's gotten a single M&M after each success, and happily eats her "deendy." (candy)
I'm so surprised, and so pleased. I'm just waiting for the hard part to start.