Just keep trying. I just had to replace my walking foot, it was shot, I also use it as the foot I piece with because it feeds the pieces smoother. Anyway, it was only $29. I thought it was very reasonable. I sure helps feed the heavy quilt through the needle. I don't use it any more for quilting, I just use my darning foot for both freemotion and stitch in the ditch. It works really well for me. The rate of success for quilting is proportional to the amount of practice. So keep trying. you'll get better. It does become fun, and there is a lot of experimenting to do, trying new patterns, echoing, all kinds of fun stuff.
Lucinda