Pounding nails into gigantic animals. This comes under the category of, nope, wouldn't want to do that for a living. But plenty of people do, even though their shops aren't on street corners anymore. They're farriers (or ferriers) and they not only make and install horseshoes, they also care for the hooves. If you remember your science, ferrum is Latin for iron, number 26 in your periodic table of elements.
It's National Farriers Week, so when you admire a well-shod horse with healthy hooves, thank a farrier.
The Mudd has many 18th and 19th century books and pamphlets in electronic format on farriery. Yes, that's a word.