DEAR HARRIETTE: I work for myself. This past year has been busier than the previous 10. It has been amazing. I'm so accustomed to having to scramble to make enough money that I accept every project that comes my way. Now that I am super busy, I am exhausted. I can't really handle all the work. I have an assistant, but I'm wondering if I need two. But then I'm afraid to take on more staff. What if …