Question for the people on here that own thier own business

i just got got a job working for a landscaper making a decent hourly wage “under the table” for this summer so we’ll see how that goes. I’ve always balanced school and work very well, so I am pretty sure I’ll be able to do it, and I’m going to start small while I finish school. and thats one of the points of working for someone else this summer, so I can get an idea what it takes to maintain 10 or 15 lawns a week so I know what I’m getting into and won’t overwhelm myself with work.