Do you trim the pinked edges if you are using part precut charm packs and part 5" squares you've cut yourself? Do you trim each square or just trim the blocks after stitched together?

I've typically cut my own, so am used to having the squares a bit more even. I'm doing the disappearing 9 patch and cut some of the black squares and all the batik squares myself, but thought it would be quick to use a black charm pack to finish. However, they are slightly larger than my squares due to pinked edges.