It may be difficult but it is not impossible. I am a Jew, and a believer in Messiah. We are known for running successful businesses and most Jews are not poor. Saying that, I am retired and low income. But my people do not work, buy and sell, or anything else on the Sabbath, anywhere in the world. That day belongs to YHVH. It is not always easy, but there are people who respect your stand, especially when you let them know that you will put the same effort and dedication out for their company on the other 6 days.