Also, you can place a pin through where the point of the star is and where it meets the next piece. Just straight through and not as if you are pinning two pieces together. this is to check that you actually have enough seam allowance or need to adjust it a bit on one of the pieces. Then if you feel the need do regular pinning either side of the point. You can also mark that point that you originally pinned through so you know where to sew.
ali