Thank you BlueSpark! Those are exactly the kinds of tips im looking for!
Wallee, yes I will be starting them in the round pen. Grit, the one who is broke to drive, has perfect ground manners, I've worked with him before, and driven him a few times. He's an angel. He's been saddled, and sat on, but that's it. I am going to take a few steps back, and start by re-introducing him to the saddle and going from there.
Cooper, is the other one. He is a little shy, and hasnt been handled much. My goal for him for the weekend is just to get him confortable with a saddle on. I'm only there for the weekend, and I don't want to push things too fast!
For without a horse, i could not fly.