if you think you can handle it, you can. a lot of people i know work full time, have families, and still go to school full time. i dont know how they handle it. i can only handle school and working per diem, sometimes going a month without working at all. why dont you try working the 20-30 hours a week on top of school and see how it goes? if after a few weeks to a month you feel very overwhelmed, talk to your employer and ask if you can decrease your hours a bit.