I have learned to not cut everything first. I understood the principle but realized how important it was, when I started my niece's quilt--with Northcott Stonehenge fabric--and made a mistake on the size of the first piece. I still have those pieces all cut 1/2" too narrow. It cost me close to $100 because I no longer had enough fabric to finish the quilt and could only find it at a US shop--with prohibitive shipping costs of course.
But I also learned that it was easier for me to cut enough pieces say for 10 blocks, make those blocks, and then cut for the next 10. I did not get as frustrated or tired and I also made fewer mistakes.
I love the pattern you are working on and it is on my bucket list.