Loved reading all these...there's just not ever going to be a single RIGHT way...and the only WRONG way is the one that doesn't work. I try to press for ease of construction... but if that doesn't give me the accuracy, well...I'll try another way! For those times that pressing to the light is absolutely best, I've been told to make sure that the darker seam allowance is graded just a touch narrower to insure that it won't creep out from under the lighter one.