Hi. and welcome. I hate to tell you this but, I never iron my seams. I piece by hand and I just let them go the way they naturally go. Machine piecing may be different, I don't know. But, I have always been told to lay your seam on the side that has the darkest fabric so that the seam doesn't show through. One quilter says one thing and another says another. that's why I just let them fall where they may. I don't guess my stuff is too lumpy or bumpy. Nobody can see the underneath of your quilt after its done anyway, so....... Just let it flow!!! You'll do okay.