It is totally doable. I use Hobbs 80/20 batting for my quilts. My machine is a Singer Confidence and only has a 7" throat from needle to the side. About 5" high. I have quilted up to king size. I don't roll the quilt, I scrunch. Tried the roll method and although it fits under the throat well, not easily movable for FMQ. I am hoping in my next life I can afford a longarm machine LOL. One has to work with what one has.
I always start in the middle of the quilt and work towards the sides. Once the sections are done the rest is a piece of cake since there is not so much quilt under the throat.