Hi, and welcome to the world of hexies. When I "whip" stitch the hexies together, I take very small stitches on the very edge of the fold. Not catching the paper. (Well, sometimes I catch the paper. :oops: ) I give the thread a slight tug, and it just sort of melts into the fabric. Also, using thread that matches the fab. helps, but that isn't always possable if you have a light being sewn to a dark. I generally use white or off white cotton thread. Sunshine's creations has a good tute. Good luck and enjoy!