I learned from a quilting teacher in my class to sew the first two rows together, left to right, then the next two rows together, then the next two, etc. When the pairs are sewn together, then I sew the two top together, then the next two sections together, etc. Then I do the last seam, which should be in the middle and the last seam. This is also how I put rows together when I do sashing, putting the short sashing on the block first, then sewing the top row together and the sashing to it and the top of the next row, which has been sewn together. I hope you understand, if not, pm me if you want more info.