I studied with JW's while at college getting my BA. I also did get "High" as a lot of college students do while in college. It was tough academic work but I loved the challenges.
During summer breaks I worked with brothers who had businesses washing windows, shampooing carpets, cleaning/polishing supermarket floors, painting, etc. I asked myself if I could drop out of college and own my own business of that sort that so many brothers were into.
My parents (non-JW) dissuaded me from that notion, and urged me to finish my schooling and then decide. Best advice I could have gotten about making this life's decision.
After graduation I tried cleaning jobs, sales jobs, and then teaching. I stuck with teaching and got my Masters in Ed. Then my Doctorate's Degree. I'm still teaching and shudder at what my life would have been today if I had dropped out of college to clean windows and supermarket floors for little pay and no health insurance or retirement plan.
The only ones I know who did well with their own cleaning businesses are those who hired other witnesses to work for them. They've taken early retirement, and have moved away from New England to North Carolina and Florida where they own their own homes to "auxiliary pioneer" where the need is greater, thanks to the sacrifice of those they'd hired for years at minimum wages without benefits.