When I teach my new students to free motion quilt the first thing I have them do is to quilt their name on a practice sample. If you can doodle, you can fmq. Another thing that is helpful is to leave the feed dogs up and set the stitch length to 0 (per Leah Day) because the little tap you feel as the feed dogs move helps them keep their stitches even. And remember you are already very skilled using your sewing machine and can do this too. Begin with something small, not only will you have less time and money invested in the project, but you will not have to deal with the weight and bulk of a larger item. You might be surprised how quickly you become comfortable with this new skill.