Pick a program which guarantees a high paying job at the outcome, and offers loans from the outset. Some MBAs offer this. If you can’t get in a program with an actual guarantee, go for one which has a very high placement, for banks will consider this when lending.
Pick a program which permits full time employment. Exective MBAs offer this. Alternatively, pick a part time program or evening program. In general, grad programs are much more aware of employment considerations than undergrad programs.
Pick up a few teaching or research jobs – the pay ain’t bad, and just as importantly these jobs fit well with your own studies, and can help land you a job after graduation through academic/industry contacts your supervisors may have. Besides, poverty is a lot easier to tolerate if you are earning your keep doing someting you enjoy than if you are flippin burgers. Along the same line, you can often use faculty contacts to pick up sabatical house sitting jobs (free rent).
Find a night job and get used to running on little sleep. (It helps if you get your reading list completed prior to enrollment so that you minimize study time while a student.)
Talk to every bank and credit union you can find to see what they can do for graduate students – quite often they are more accomodating than they are for undergrads.
Find an employer who will cover your tuition and living expenses. (Unfortunately, you usually have to be pretty high up the ladder before they will do this.)
Camp out in the financial counselling centres at a few universities for leads on bursaries and scholarships – you’d be amazed at what is out there. (I picked one up because I was a “Nice guy”.)
Get your degree online. Some offer entirely on-line grad degrees (e.g. the Athabasca MBA), and quite a few offer on-line grad degrees with only a short on-campus residency requirement. Check out the Open University in the UK (and now in the US to a limited extent).
On the flip side, start planning for poverty now to avoid paying when your cash flow is dry. Look into communal living, be it with a group of fellow grads or a frat. Look into low cost nutrition. Pick up now whatever property (clothes, car, computer etc.) you expect to use as a grad student.
If you are going to be living on the street, pick a university in a warm climate. (I messed up on this one and ended up spending a Canadian winter without heat, electricity or water in an empty shell of a building.)
Finally, keep your goal in the front of your mind. At worst, it’s only a few of years of exhaustion and poverty. That can be withstood. At best, you might find that once you take the plunge, you can swim after all, and might just like it.