I started out with a Farrier Science course (check your local community college), then rode around with a farrier, then progressed to trimming AND shoeing my own horses. That went along great for probably 8 years until I had some health issues and just wasn't able to shoe anymore.
I tried hiring a couple local farriers and wasn't impressed with any of them. (One thing you should know is it isn't even required for a "farrier" to go to school here in the USA, so you don't even know if the farrier you are paying has much experience or training- they could be anybody). So I thought, well, maybe if I could just shoe the fronts, it would be less work.
So I started researching barefoot horses and found out that not only was it okay to ride them, but it was considered a lot healthier (something I also learned in Farrier Science) and that I could use hoof boots if needed in the rocks.
So I ran with that idea and have been happy ever since. Horses are sound and healthy. I'm happy and don't ever have to pay a farrier. Don't ever miss a ride due to a lost shoe, nothing!
So I don't think I will ever go back to shoeing my horses. I see no reason to. I trail ride and I can do that perfectly well barefoot, or with boots. Boots are just removeable horseshoes after all.
PS. I think the secret to sound barefoot horses is never take off any sole (unless it is flaking off already), and keep the feet as dry as possible.