I have a three 1/2 year old Shire/Percheron cross that I bought several months ago. My husband is new to horses completely but the men at our barn have convinced him he needs to drive "our" horse (yes, he suddenly belongs to both of us now). I have never driven before ever but they all assure me it's easy. Ha ha ha. The guys, though, had been fantastic. We have a full harness to use, offers to use carts, skids, tires to start with, ect... The full harness we've put on him several times and haven't had any real issues or trouble. I, naturally, have ended up doing to most ground driving. Since its large and awkward for me, I typically end up ground driving after my ride with my lunge lines through my stirrups. When my husband is available, we do the harness and in the next couple of weeks, we'll hook him up with a tire.
I would to get some hints, advice, and even what you all "do" with your driving horses.