Since your business is still fairly new why not just set your days that you are closed as Mondays and Tuesdays (if those are the days you want to work another job). Post your days/hours on your door as a normal, regular schedule. Your customers will learn your hours. Sure you may get a few disgruntled or confused people at first...but you gotta do what you gotta do to keep your business going. If it means getting a part time job two days a week, then you should do that. As business picks up and you can quit the p/t job you can change the days to include Mondays and Tuesdays again.

It's not an ideal solution, but you need to be able to pay your personal expenses while building your business.