When learning to FMQ on my domestic machine, practicing by drawing only went so far. My brain didn't connect a moving-the-pen motion of drawing with the moving-the-paper motion of FMQ. What it did do, however, was help me to figure out where to go next so you don't quilt yourself into a corner and if you do, you know how to get out.
I cut a bunch of squares of batting & muslin and practiced. After a couple of initial sessions, I picked the design that was my easiest and best and concentrated only on that one until I got it down. After feeling comfortable with the first design, I slowly added more. Personally, I never could follow a stenciled pattern very well, and never was able to do loops. After you are sure you've got your tension sorted, you can just keep putting a new piece of fabric on top of a used sandwich & quilt again.
I'm sure there are naturals who just sit down & do it, but for most folks, it just takes a LOT of practice.