Tomara & Delfina -- Don't panic. We were all new at one time. The HSTs and the squares you cut from the light fabric are to be 2". When you sew them both together you will end up with a 2 x 3-1/2" rectangle.
HST = half square triangle. Delfina, you made some of these when you made the square in the "Quilting Bee" forum.
For anyone using the 8 at a time method for HSTs, the starting square is 4-1/2". I cut mine 1/8th inch larger and ended up with perfect 2" squares and didn't have to trim.
Last edited by Belfrybat; 01-21-2017 at 10:52 AM.