I made all of the square in a square sections first, but I see many of you making the whole block, which is great. For those who want to move forward I thought I'd let you know what I did as far as pressing. There didn't seem to be any good way to press the seam of the center square.
So I clipped my seam, and practiced, either ironing it open or to the plain square. Clipping and ironing to the plain square was what I found to be the best for a nice flat block.