A long time ago when I lived in Nashville, there was a guy who did pedicures and other things. He went by the name of "The Foot Doctor". I worked with this nurse (very pretty, MILF) who went to him all the time. She loved it. Later...she started talking to me about it when she found out that I was into feet (she had set me up with one of her girlfriends and we were a couple for a while).
She would say, "to do that work, you really have to be into feet." She suspected that he had a fetish, but that concept...fetish...was not a mainstream concept back in the day. But he paid extra attention to the feet. Particularly throwing in a foot massage in with the regular pedicure. The ladies loved it.
I made a mental note to consider learning to give pedicures and to do nails. Just like I have made a mental note to consider doing tickling...with sound and film...as a hobby. You should do what you like.