Hey, my experience has lead me down the road of being a one person window cleaner to a business person with 5 workers.
I say workers because I sub out my accounts; (about 300).
I resorted to hiring people when I developed tendinitis(tennis elbow) in both arms. Really did not have a choice. I did cortisone shots, arm bands, exercises, etc. It finally got really bad and I started slowly hiring help.
Once you go in this direction you really can't turn back. Management is a full time job. When you do clean windows you have 2 jobs and the management part suffers if you become a laborer again for long.
Boy am I glad I did this about 10 years ago because when my son died I crawled into a mental cave for at least 6 months. Could not work.
Thank God I had a decent staff at that time because I floated along financially OK.
I too learned everything about business from the school of hard knocks because my education was in the teaching field.
Never did teach. Began window cleaning to help a friend; liked it and never looked back.
From time to time I have thought what a pain in the *** dealing with workers; but you get used to it and develop better methods of screening, hiring, etc. The business part is also learned as you go.
I always remember to treat others the way I would like to be treated. It keeps things real.
Best to get advice if possible if you are going in that direction. I would highly recommend becoming a business person as well as a laborer if window cleaning is a long term goal.
I have operated my business from my bed when I was ill; on the phone.
Anything is possible if you want it and aren't afraid to work for it.
Now I am rambling; but I am serious.
Hugs,

Texas Girl