I've never done a Join Up, or even heard of one until this week. Will he automatically run in a circle in a round pen? I guess since I'm getting used to him I want to make sure that when I'm driving him to move, he's going to stay on the peripherals of the round pen! I've heard of horses rearing at the 'driver' while doing this, and it has me a bit wary of trying this alone with a new horse. Also, if it's unsuccessful, will he just become fearful of me? I don't want to make things worse!