FMQ just takes Practice, practice and MORE practice !!
Don't even begin on a real quilt until you have done DOZENS of practice squares!! and ALWAYS, always WARM UP on a practice piece BEFORE you start on a quilt !
Always use the same thread, top & bottom
Increased machine tension often helps
Use THIN cotton batting or cotton blend, a thick or synthetic batting will cause you endless frustration
Try the Bobbin Genie inserts (small white teflon washers) if you get backlashing (eyelashed stitches underneath)
Wear comfortable gloves (like Machingers) or the Quilt Halo etc works well for many
Check out FMQ videos online, TONS of good tips & tricks
PRACTICE ... RELAX ... BREATHE !!! You can do it !! :)