I free motion quilt on my domestic machine and love it. I actually have no desire to quilt on a long arm. I started out sewing with a little Walmart Brother and that's what I learned FMQ'ing on. I later got a Bernina 440 and as much as I loved that machine, the throat space was way too small. I quilted many, many quilts on it from small wall hangings up to a 90x90 bed quilt. Big quilt can be a bit tricky with smaller throat spaces but you're only in the center of the quilt for a short time. As you move out you have less quilt crammed in the throat and quilting is easier.
Jumping in and giving it a try is the only way to learn! Best of luck! :)