There are papers to size the HST or you can work through this method. You will need to adjust the square size for the pattern. This shows the technique for a 3 inch HST.
https://teresadownunder.com/2018/05/...ideo-tutorial/
Here is the chart for different sizes.
https://www.blossomheartquilts.com/2...ght-at-a-time/
I over-sized LC blocks and then trimmed down to size as I sewed. Be sure to starch and press fabrics before starting the blocks. Check your seams for accuracy so the blocks finish at the correct size. This is an intense pattern but just follow each step for each block. Good luck!