I Press the first seam open and the second one I press towards the corner triangle. I don't press both seams open.
Doing it this way shows the interlocking point at the 1/4" seam that you want to match when sewing geese into any block. Finding that point and not catching it in the seam allowance is always a problem. Now I can just put a pin in just the right place to match points and not loose them in the seam.
peace