One of the benefits of making a Bonnie Hunter Mystery quilt as a new quilter (I did this a few years ago) is that I learned how everything really starts with accurate measuring & cutting of your fabric. She also emphasizes a consistent 1/4" stitch - which is often a challenge. Even with the best preparation I still square-up blocks as I go. Some are intentionally cut over-sized necessitating a trim/square. Regardless, I almost always trim/square even the simplest of blocks. It makes everything come together so nicely in the end.