Not that fussy at all. If you Google the pattern, she gives a free pdf with step by step instructions. (Mod mosaic block Elizabeth Hartman) The only precise cutting is the sashing (1") I chose black for the stained glass effect.
The rest of the cutting is a kind of stack and whack, as you go, you overlap the two pieces you’re about to sew and wonky cut them, so they match, then sashing between. Check out the pattern because there are lots of photos. It’s very straightforward.
If you’ve a small cutting mat to one side of your machine and an iron on the other, you get through then fast, because you don’t need to keep standing up to cut.
Plus with her method you can use any size scraps.
I’d love to see what you make.