Don't get discouraged, we've all had days like that, where nothing much seems to be going right, but don't give up. Put the quilt top away for a day or two, start another project or just walk away. When you come back you will have a fresh perspective. Also, if you feel you're not making much progress, try to take a class, even if it might be something you've done before. I have yet to take a class where I have not learned some wonderful trick, a twist on an old block, something, and that makes it worth taking the class.