Hopefully, you have a great lawyer (as I did) who will make the whole process a little less scary. If you see no other workable alternative, then Chapter 13 can be a solution. Of course, you already know it's not an easy fix.
ALL of your disposable income does go for creditors, attorney fees, and the trustee. However, it is important to make sure you account for ALL of your legitimate expenses. You are going to be in Chapter 13 for at least 3 years, so you have to have enough to meet your needs. My attorney helped with that, but he included in my expenses things like car repairs, taxes, clothing, etc. It's fine to say you are cutting back and living on a budget, but you have to have some money to do stuff like that during the years you are living in Ch. 13.
The day I signed my bankruptcy papers was very scary. The budgeted expenses and my required payments left me with a $300 deficit each month. I just want you to know that there is a light at the end of the tunnel. Hope things work out well for you!
10/19/08 .....EQ 647
9/30/08 .....EQ 637 .....TU 615 .....EX 630
7/14/08 .....EQ 625
5/2007 FAKOs ALL 500ish