Thank you so much for the wisdom, Walkinthewalk! I love hearing story's about people's horses, and you seen to have quite a connection with your's.
From what I've seen and from what I've heard about her from her owners, Missy is quite a lot like Duke. She doesn't seem to care too much about what I or anyone else does. Certainly not an in your pocket horse! The only way I can get her to turn her head when she's stalled is to offer food. While chewing, she's plenty in your pocket. She takes an advantage over kids who can't ride as well... When we first started boarding her, we figured since she was calm on the ground and fairly old that it would be okay to put an eleven year old on her. That horse had a field day! Ran to the middle of the round pen, tossed her head, gaited off as fast as she could, and caused general havoc. She was perfect for the experienced riders and I though. Crabby, but still worked.
I'm certainly glad to hear they're a forgiving breed... I'm not a beginner, but I'm no expert. I'll make plenty of stupid mistakes.