I like a 80/20 batt because it is more stable for FMQ. Baste well with whatever method you like. Try a few sample squares to get your tension adjusted, take pictures of your original tension settings so you can move them back for regular sewing. If you have sashing, stitch the straight lines first so they remain straight and work from the center out.
Pick a FMQ design that has stopping spots so you can adjust your hands. Use your needle down feature so when you stop, the quilt is locked in place. If you can adjust your speed, put it on medium. Get Machinger gloves to help move the quilt. Make sure the whole quilt is puddled around the machines so there is no drag. If you don't succeed the first time....try, try again!