I quilt mine in the ditch and I am far from perfect. My machine has a special foot that helps follow the seam line and it gets the job done. Nobody has ever looked at my quilts and said "Well, Martina, your SID lines are not perfect - tsk tsk" so I keep working at getting better.
If you are interested at learning FMQ, I'd suggest checking out the tutorials on Leah Day's blog. She has a lot of sample patterns to show and she works on small squares to practice.