I quilt on my Janome 6600 and have done several King sized ones and know exactly how difficult it can get. I found that if I put my ironing board at table level on my left of the machine, I could use it to help hold the bulk of the quilt. The roughest section was going down the middle when there was so much bulk to the right of the needle, but once that is done, you will find it much easier. It would also help if you can move your sewing machine/table away from the wall so there is plenty of room behind it for excess quilt.