I did a king size on my Bernina 1090. It was a challenge that I just had to conquer!
You just have to take your time and work in one area, then shift and work in another.
What did you think of the craftsy class? I signed up for some free ones and paid for one class on advanced fmq. I'm still working my way thru those classes but there are a ton of quilting classes that I plan to take thru craftsy. (I have no association with craftsy.) Just want some advanced classes in quilting.