Well, I was educated to be a research horticulturalist, but when I graduated the University in 1980 they wanted to offer me jobs like watering greenhouses for $900 a month.
Became an entrepreneur, landscaper, irrigator, etc. Never got wealthy.
Saw an opportunity to startup an international introductions agency, lasted 6 years, lot's of travels in the former USSR.
Finally found my "financial security" in a blue collar startup, installing and servicing underwater submersible pumps for the ultra wealthy living on lake front property in Texas. Retired now, debt free, massive savings, going to sell the business. Cannot complain about ski boating to and from work everyday while others are bumper to bumper in stop and go traffic on the highways. And the view, well, it's all nature. I was typically always on a large shaded dock or "boathouse" of a customer, if the heat got to me, just jump in the lake to cool off. Skills required: experienced scuba diver, electrical, plumbing, something of a pump specialist-engineer, chief salesman, chief website designer, head bottlewasher, etc, etc. Healthier than sitting in a office all day staring at screens.
Probably the most significant item I learned from so many different occupations ? For me, it was about your "overhead". What are your fixed and variable expenses ? What does it cost to run the business ? The lake pump gig was a business I could run almost by myself, only one day labor guy to help me on installs, so overhead was incredibly low. No lease space, ran it out of my garage.
edit: instruments, double jointedness
The primary key to any such interesting display is discretion. If everyone knows you play the piano, no one cares. If no one knows, and you hit Tchaikovsky's 1812 in the mall, everyone's shocked.
A buddy went all in a bought a huge milling machine, but I'd prefer the table top version to start.
You can start really cheap with just basic hand tools, there are lots of bench size machine tools, like mills and lathes, that come onto the market as their owners age out.
Know that if you do get a mill, lathe, CNC, etc... fixtures, jigs and cutting tools will cost at least as much as the tool itself. All the things like vices, t-slot hold down kits, various milling and lathe bits add up fast.
https://www.youtube.com/watch?v=gaDdrDdczO4
looks like he has some new ones
Going from not juggling to juggling knives can be done in perhaps weekends.
Then, of course, you can do all the fancy multi-object patterns, but I've yet to see a reaction to three spinning knives surpased by five+ tennis balls. The five+ tennis balls are neat while the three (even just two) spinning knives is always a visceral holy shit please stop you're going to hurt someone.