I had a home equity line that ended up getting maxed out. EDIT: And got loans. Everyone does not have that, I understand. I am not good, I am afraid, with pointing to the best financial solution. Working while in school and government student loans is the route I would suggest, but most colleges have decent financial aid counselors that can help and tell you what is available. There are multiple different types of loans.
Not sure if this is helpful, inspirational or a desire for pity :), but....
I was 35, had a mortgage, a wife that worked retail and a kid, after doing only school for a year, my wife found out she was pregnant and then while I was finishing school after the kid was born, the wife got Teh breast cancer. There are no guarantees, obviously, and nothing seems easy at the start and it will most likely be difficult and you will think you cannot take it, but if you can persevere, it could pay off better than you could imagine. It did for me....my book will be out in the Fall. ;)