A little tip that I got when I first started was to use a lighter grip on the handles. My mentor told me to drive the machine using my fingertips and not my whole hand and for me, that worked. As I got more comfortable with pantos, I resumed my regular grip. And don't forget to breathe. Our movements tend to get uneven if we hold our breaths. Some quilters even pace their breathing with their stitching.
Don't get discouraged. As you get more comfortable with the process, you will like your work more. And remember, the only person who sees the line on the panto is you. If you get off a little, no one will know.
And I agree with the previous post --- Chantilly Lace is a great pattern to try.