http://www.mqgvictoria.com/2014/06/hst-tutorial.html
My Guild did a charity project using HST. The above link takes you to the various tutorials we had for making the HST blocks. I used the one that made 8 at a time. I did oversize my blocks and trim as I am not accurate enough to have 8 come out perfectly. I think I started with my original squares 1/2 inch larger.
By making 8 at a time the bias was on the diagonal seam and the outside edges were straight of grain.