They're no different than a light horse in how you would approach the process. Tack is always a challenge. Some will fit into 5 1/2 bits on an O/S bridle while others need 6 or 6 1/2 with custom bridles. Dressage saddles tend to be the best fit option unless they are young and don't have much back muscling. Those ones will be in 32 cm+ or full QH bars. The biggy is your leg strength. Some are so animated and powerful in the way they move plus with the added girth, it can be exausting just to stay on. The other one is no impulsion so you're constantly after them. Mine rarely canter even at liberty. Be prepared to spend extra time getting that done.
If the horse has been broke to drive, alot of the work is done. He knows how to be "saddled", turn, stop, back, stand... The big difference is your legs (use voice commands to reinforce the leg, seat and hand cues) and working above him. Do your first few rides in his driving bridle so he's not worried about what he is now seeing behind him.
Last edited by Left Hand Percherons; 03-30-2011 at 12:16 PM.