I was a lot younger when I did this and never really thought about it. I was in much better shape too.
Working in an office made me super lazy. After I got comfortable in an office job, I couldn't
imagine working a second job "for the heck of it."
But I was more of a hustler then. I need to get that spirit back.
I don't have any tips because I didn't have any problems with it. As long as the schedules worked together, I was good. Enjoy!