Go to any large state school you can think of and look at their estimates for total cost to attend (including room and board). It will run about 15k. two 15 week semesters leaves 22 other weeks for full time work, plus part time during those 30 weeks in school. That's about 1600 hours of work for the year. at $10/hr and you end up with 16k before taxes. That's not enough, so you need to take out a loan.
http://www.loantolearn.com/products/loan_to_learn.asp
For a 20k loan you pay $115 a month while in school. that shouldn't be too hard since you're making at least $400 a month even if you're working min wage.
Yes, it's hard, but it's still doable.