If you are using the [Finished Size HST + 7/8"] to sew the 2 HSTs in one, you may want to rethink that for a beginner. It is really important to have a PERFECT 1/4" seam using that method and after MANY years of sewing, I still have trouble getting that measurement down perfectly. I always cut mine oversize [+1] and trim down later. It is more work but gets a better result.