The above method is correct to give you two HST's. Sounds like you're making a pinwheel block, or similar - if you want all four HST's to be of the same two fabrics you can do it the MSQC way - two pieces of fabric for four identical HST's (stitching on all four sides of a square and cutting twice diagonally to get four HST's). To do this, start with two squares each 9.25 to end up with a block to be slightly trimmed down...or maybe not, depending on your stitching