I use templates. If you use my cut down method you sew two fabric pieces together and then use a square template of any size and cut out a square from the middle.
You can use any method of making half squares that works best for you.
I have templates made for me and I add a plastic grid to the back of them. I also have rulers that are 2" x 9". This is my favorite size to work with.
I do miniatures so I use a 1 1/2" or a 1 1/4" acrylic template. The size of the HST can be anything you want. Just use a larger template.
I offer the 1 1/2" and the 1 1/4" free to anyone who wants one. Just send me your postal address if you would like to try one.
My free tutorials on the Quilted Paradise Newsletter
http://www.quiltedparadise.com/n/230-jzl.jsp - cell phone case
http://www.quiltedparadise.com/n/231-uzl.jsp - bookmarks
http://www.quiltedparadise.com/n/232-uid.jsp - softbox pincushion 1st half
http://www.quiltedparadise.com/n/233-uid.jsp - softbox pincushion 2nd half
http://www.quiltedparadise.com/n/067-ezl.jsp - keychains
http://www.quiltedparadise.com/n/038-oqk.jsp - mouse pad--star point