Horse's hooves are like fingernails, and need a trim every 6-8 weeks. Same procedure, but with really big clippers and a really big file. See lower part of tool box:
The three trims and two shoes took a couple hours. The biggest problem isn't keeping the horses still - they're well-behaved - it's the flies. The little buggers bite, and they buzz all around the horses, especially their legs. Trying to trim a horse while he's stamping his feet is not easy. Also not safe. Fly spray helps keep them away, but not entirely. While I stand there holding the horses I usually swing the end of the lead rope around their front legs to help chase flies away.
And those are just the little house-fly size flies. Horse flies - now that's another post entirely.
Another annoying problem while shoeing horses - owners who make you pose during the procedure so they can take pictures for their blog. Thanks to Bill the Farrier for his patience!