fold the left side of the seam on the top piece over to the right as though you want to nest them.
once they are tightly nested, put a pin to the right of the top seam allowance and then pin to the left, letting the left side of the seam fall back into its "open place."
i learned from a friend to also put a few basting stitches across each intersection and check to make sure it has all remained lined up. those few extra steps have saved me loads of time i might have had to spend fixing "kka-joings" at intersections.
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- necessity is the mother of invention. lazy is the crazy aunt.
