Yes, Frannella, I am still loving my Juki J-350QVP sit-down. I've quilted several quilts on the machine and it does a great job.
Regarding problems with moving your quilt: I'm not sure what accessories came with your machine. The teflon slider on my table makes it easy to slide the quilt around, and the extensions help to keep it from hanging off the sides and causing "drag." I wear the Machingers quilting gloves when quilting because they make it much easier to grip and move the quilt around. I find rolling the quilt so that only the portion of the quilt on the table is unrolled has helped me reduce any drag.
As far as the FMQ part goes, Leah Day, Angela Walters, and Lori Kennedy offer some great tips for beginner FMQ. YouTube.com also has many videos on FMQ. Even the videos on using a domestic machine for FMQ are helpful because the tips on using a domestic machine are easily transferrable to using the Juki sitdown longarm. Although I had experience doing walking foot quilting on my domestic machine before getting the Juki, I had not done any real free motion quilting. I have zero drawing talent with pencil and paper, yet alone trying to do it on a sewing machine. I do a lot of charity quilts for kids and found a meandering loop pattern to be a great beginner pattern. Meandering loops are a very easy beginner pattern that allowed me to focus on becoming comfortable with using a new machine and learning the easiest way for me to maneuver the fabric.
Here are links to a couple of Leah Day and Angela Walters ideas/tutorials:
https://leahday.com/pages/quilting-design-gallery
https://www.youtube.com/results?sear...angela+walters
I'm not sure if this answers your questions, but I hope it's at least somewhat helpful.