I did my first project (a piano topper) without a walking foot. Make sure you starch it just about to death. That was a tip I got on here when my project kept quilting weird. And since you don't have a walking foot, you may have to stitch very slowly. I know I had to but it did get done.
The other possiblity if it's the foot that is causing all the trouble, get rid of it and do some FMQ. It's scary stuff but doable. I've done a couple of pot holders that don't require me to wear a bag over my head.
Be patient. You will get this done.