I ride horses, but haven't on the Camino. I do remember seeing some riders out of O' Cebreiro and thought the horses looked in great form and very fit. The saddles weren't Western style with the pommel and wide stirrup bar, more similar to an English style - no pommel and a slimmer stirrup bar. You will need a sticky backside. The riding is over uneven ground up and down hills, in addition to wide open spaces for a good canter and fast gallop. My advice wear a riding helmet, riding boots and jodhpurs if possible. Not particularly practical pack wise on Camino though. The seams of jeans or other pants can really bruise and rub the inside of your legs on long distances. As you are new to riding horses, get some long distance riding in before you go if you can, horses have a ton of power and it could be a world of hurt for both you and the horse. Have fun and stay in the saddle.