Hi....I know I will likely sound like such a newbie....but what is a HST..... I just watched this wonderful tutorial on the Missouri Start Quilt Co...and she showed this flying geese ruler.....but of course the pattern I picked out has the finished size of the flying geese that don't match up with any of the rulers I have searched for online......I am getting a little frustrated and so nervous and I haven't even gotten down to my sewing room yet.....