While my horses are barefoot most of the time. I'm in no way a proponet that Barefoot is the only way to go. My post and photos were not an encouragement for bright eyes or anybody else to take their horses barefoot full time. But rather to illustrate that they can survive a day or two of being ridden with out a shoe.
If your horse is ouchie after loosing a shoe, Then some kind of protection is probably in order. You choose whats appropriate, hoof boots, duct tape, or something of your imagination.
I'm not a big fan of boots for everyride use. It cost more to use boots than just shoeing the horse. At least for me with lost boots, torn gaiters and broken buckles. But I do believe a hoof boot can provide comfort for a horse that might need some protection for a day or two. I've seen many a CTR rider finish a weekend with an easyboot because they lost a shoe on Saturday. The choice becomes pulling from the ride or using a boot for the final day.
I agree with Kevin, If you are not familar with pulling shoes. Leave the opposing shoe and let the farrier pull it when he comes. and the same goes for using a rasp. If you are not confident of what needs to be done, Leave it for the farrier. But in my experience, shoes are usually lost later in the shoeing cycle and the hoof wall is usually on the long side. Between the damage that nails did pulling out and the hoof wall chipping your horse can become tender very quickly. Touching up a trim, if you know how, can help keep your horse comfortable.