I learned to make hexies with squares with the corners cut off. I then center the fabric over a paper hexie, and fold over the edges, holding it in place with a paper clip. I hand sew it together, folding over the corners, making a small stitch at the corner before going to the next one. Works for me. I can make a ton of them in a short time. I am using a 1" hexie with 2 1/2 inch squares, pressing them when they are done to make sewing them together easier. The left over squares (and I have a lot of them) are being used for enders and leaders and I am stringing those together to make another quilt. Double duty!
I am making a GFG with them, and sewing them together by hand a well with a whip stitch.