Gypsy Wife is one pattern that your blocks need to be very accruate in sewing as you are fitting different sized blocks in with strips, and if you are not accurate it's not going to come together correctly. Sometimes you are sewing three strips with a block on top, then you sew another strip along that, and sew that to a bigger block -etc. As you assemble, keep checking your measurements to make sure you are not getting off on your measurements. Sometimes you may want to sew with a different seam allowance to get back on track.
You can ease a larger block into the strips, but if you try to stretch a smaller block to fit into the strip it won't work so well.