My suggestion would be to consider the folded corner clipper tool by Creative Grids. It makes HSTs so easy and accurate without all that drawing of lines or complicated techniques.The corners are already clipped off so there is no trimming and the pieces always match perfectly. Layer the two colors you want to use, cut out the pieces and stitch. Perfect HSTs every time.They make two sizes depending on the final block size you want.
https://www.creativegridsusa.com/products/CGRFCCXL