As an auto mechanic, I worked in a shop with no heat and no A/C. We had a nice heated and air conditioned office, but that was for customers. So we ate our lunch sitting on concrete steps out in the shop...freezing in the winter and steaming in summer.
I had $12,000 worth of tools, and I had to buy my own insurance rider to cover those tools that were required as a condition of employment.
I had to work on the boss' cars for free all the time.
When a car was fixed, the customer would tell the manager how great it ran/drove, but the manager never thanked me for the work.
When the shop did well, my boss got a bonus and I got nothing.
I finally went back to college and got two degrees, one in Engineering and an MBA in Finance. I've never looked back.
I loved the work, but the conditions were awful.
I must say that I save a TON of money for my family by knowing how to fix cars. And the skills learned transfer over to other parts of my life. Being mechanically inclined, I've been able to fix faucets, water heaters, garage door openers, ceiling fans, washing machines, and I could go on and on. I don't know how the average person can afford to hire all those professionals to fix issues around the house. I've only had to hire a technician twice in 12 years for our house...things I just didn't know how to do.
P.S. Just this week I fixed our ice maker. I'm sure that would have cost $200 if I needed a technician.