I remember when I got mine thinking that it was a huge mistake. I struggled so much with it but kept on practicing. I did find that the thread kept breaking no matter what kind I used. I also tried all kinds of needles, but it wasn't until I went to a larger needle that I stopped having that problem. However, the thread tension was a disaster. I have always been told that no matter what, you don't mess with the bobbin tension. Well, at one point I decided I had nothing to loose and did play with the bobbin, and all of a sudden it turned out right. Now I am not afraid to touch the bobbin when I have problems.
With all that, it does take tons of practice. I've had a quilt loaded on my frame for several months and finally decided it's time to do the rest of the work. My quilting is terrible. If you don't keep at it, you loose it. So don't quit. Keep trying and one day it will all click.