I was a theatrical Lighting design major in College. Didn't matter, all backstage tech had to take at least one semester in costume, so we did a 6 week sewing lesson Fast foward a dozen years and I am married to an accountant. Fast forward another 20 years and my wife leaves corporate accounting, to go inter her own business. we now own about 10 machines: All of them industrial, basically, large metal motors, little faring, and huge horsepower. Surgers, Blind Hemmers, Walking Foot Machines, ones that can do embroidery, etc.
Still, when I am called upon to fix the machine or timing, I can at least remember, how to thread one. Well, maybe 1 out of 3 times. But, there's always Mr. Google.
Funny you say that, I have created a new problem. The whole family are into experimenting with the sewing machine. The place has turned into a mess as they pulled out old clothes, tea towels, sheets etc (that are in my opinion, beyond repair) to experiment with. I should buy another needle before this one wears out and a lot more thread.
If you can start a business based on something you have a passion for, that's freakin awesome :-)