I can't say enough for the Supreme Slider, I had tried free motion off & on for years, just couldn't get the hang of it, then I used the Supreme slider-it was wonderful & helped my brain & hands get the idea to work together. I used it until I actually wore it out then discovered I didn't need it anymore, I had finally caught on. Now I love free motion & do all my quilts with free motion.
Another big tip that came from a sewing machine tech is to use a Stretch Needle, meant to use on knits but can be used on any fabric, the Stretch needles have a longer scarf & help prevent skipped stitches, I consider it a miracle needle.