I agree with Tartan, I sew a square on either side of a rectangle, which is the size of that portion of the block, and I get good results 99% of the time. That's not to say I don't get a klunker now and then, however, I have had very good results. There is also a tutorial, I think by MSQC, or Quilt in a Day, where you use a slightly different variation and get 4 flying geese out of one square of fabric with squares. I can't explain it, but it looks much easier to me.