I did it sometimes in more than 3 sections because I like my quilts to be reversible. So, I do a large square middle section, than, I add the 4 large borders. I zigzag my batting by machine with a large and long zigzag stich without pulling or pushing the batting through but letting the machine do the work. Here a video that talks about it
https://www.youtube.com/watch?v=Ry6QTj3fA1s