Like others have said, if you want it enough then you will have the drive to work to pay for it.
I did a law degree, it was one of the heavier courses timetable wise (compared to friends doing courses such as English, History, Media Studies etc...) and harder to work during term time but I did all kinds of jobs on the weekends and worked crazy hours in the holidays, staying and renting somewhere cheap rather than going home.
I did all sorts from supermarket work to Burger King, waitressing, cleaning, kitchen work, working in an estage agency. I used to do numerous shifts a day in some jobs like the supermarket one at some times.
I did a vocational degree followed by law school and went on to qualify as a solicitor so I'm with China on the 30+ unwed, no kids but a career bandwagon ;) I can also speak for other female friends who did degrees who are solicitors, teachers, industry scientists, lecturers and all sorts of other professionals, making very good use of their qualifications.
Similarly I have a number of successful female friends with no degree with great careers, if you have the drive and the work ethic then the sky is the limit.