Vielka Cecilia Hoy, Founder/Director at Vielka Hoy Consulting, Teacher, and Parent
I also agree with the above and would like to add that, in terms of percentages, working too much while in school is a top reason why students don't earn their degree. As in the other responses, what is too much is really dependent on your situation. I would just be super aware that the thing you have to do in order to get the even better thing may get in the way of you attaining that even better thing.
I have discussed how to afford college on my website (vielkahoy.com) and in a recent Noodle article. You will want to absolutely complete the FAFSA at the start of the year, and even do the net price calculator to see how much you would actually pay at whichever school. Then you would work towards reducing that cost. You may find, as the previous answers stated, that you don't have much to pay or can use another financial aid program such as work study to offset the cost.
I hope that helps.