Get yourself a MagnaDoodle (child's drawing toy) or a whiteboard with erasable markers. Choose one design that you would like to be able to quilt, like meandering or loops or leaves - nothing too difficult. Now practice over and over and over on the drawing toy. Chant to yourself to get a rhythm going - 'up and to the right, down and to the left' or 'one, two, three, loop, one, two, three, loop' or whatever will help you keep you from crossing over or getting boxed into a corner. The more you do it, the easier it will get. When you feel more confident here, then move back to your machine and fabric. Your brain will now have this 'road map' saved, so that part of the process will be easier.
It can be frustrating at first, but one day it will all 'click' and then it's so much fun!!
Andi