Keep practising. As others have said, put on a throw-away sandwich, and practice on that. I have only had my machine for a week and a half, so I'm definitely still a newbie. I did a practice sandwich (1 yard of fabric, full width) each of the first 2 days, and I made some comparison points. For example, I wrote my name at the start of day 1 (and it's not a nice smooth curvy name) and then again at the end of day 2. I still don't think it is great - but I can look at the 2 attempts and see worlds of improvement from the first to the second. That gives me confidence to keep going.
Another comparison point - I took one of my practice sets and divided it into squares with a marker. Then I quilted a different sampler pattern in each square (try 365 days of free motion quilting
http://freemotionquilting.blogspot.c...ilt-along.html, if you are looking for inspriation). I plan to repeat the exact same sampler in a few weeks, so that I can see my progress. I find that if you look at each day in isolation, they are never perfect. But if you can see your improvement day to day, week to week, that provides confidence and the incentive to keep going.