Going back to school for a second bachelor's - financial aid, etc.

I realize there is probably no financial aid. I just want some guidance on weighing my options. I am working full time and want to go back to school to change careers; I need to go to school for this as there's no way to get in my desired field without a degree. Any advice would help. I am going back for physics (not to be a teacher) and it would require me likely to pay out of pocket, which sounds difficult to do.