Need help with cutting last border.
I have a quilt top. The center panel is appliquéd and there are 12" Sawtooth Stars blocks around that and a 4' border. When I measure for the final border I get 86" x 79". But when I measure across the center of the top I get 85" by 78". How do I cut my last border? Or do I try to cut off the first border to make it square? What are my chances for this thing being flat? This quilt is my daughter's wedding present and I'd like it to be a perfect as possible.