I have a disability and before I got my cutting table I cut on the floor and leaned over a laundry basket to take the weight of my knees/hips. The laundry basket might not be practical for you (I am very short), but maybe a similar idea would work? I know someone who can cut sitting at a table, I have no idea HOW she does it. I can't get enough leverage when I sit.
Here is a photo of my set -up in a blog post I wrote recently.
http://blog.unlimiters.com/2014/01/0...ited-quilting/