You can pretty much get as much as you need. Here's how my financial aid went. Filled out the FAFSA (free federal financial aid form, or whatever it's called). Got my award letter from the school which included the full stafford, sub and unsub amounts, and the grad plus, which was set at the default amount. After tuition, I would have had about 1k a month to live on, in northern california, which is ridiculous.
I contacted the fa office, requested a re-eval of my personal cost of attendance. I had to give them a very detailed monthly budget, along with some supportive documentation (mortgage statement, etc). I padded things a bit knowing from previous students that they tend to low-ball a little bit. They pretty much gave me what I needed and asked for. In all, I ended up borrowing just under 40k from the feds for the 1st semester. Before you all start going crazy, remember I live in northern california, and my program is a private school which is front loaded with a lot of units the 1st semester.
I just wanted to demonstrate that it can be done with federal loans alone. The money is there. You may have to be proactive and get the fa office to see things your way, but you should get what you need.
Dont' freak out about the price tag of school. It's an investment with solid returns. And, you'll be able to consolidate your loans for reduced interest rates after you're done and may even be able to get some tuition reimbursement from an employer.
Good luck and feel free to PM me if you have any questions. (Be patient if i don't respond quickly, CRNA school is pretty busy to say the least).