Hi, I'm new to the board. I need to cut the fabric for the back of my quilt. It is about 80"x108". I know I want to cut it so it will have three pieces sewn together so the main seam is not in the middle of the quilt. I am extremely visual and need to see pictures or videos. I've been searching the web and I am not finding pictures/instructions/videos that are clear enough for my feeble brain.