Most freelancers learn this lesson the hard way after saying yes to too many projects at once. The money can be tempting, especially when opportunities keep coming in, but there is a point where taking on more work starts to hurt the quality of everything else you are doing. Some people set a rule for themselves around working hours or number of active clients, while others go by how stressed they feel at the end of each week. It is not always easy to draw that line. When do you personally decide that enough work is enough?