How would one be sure this guide were safe to follow? Similar to how one knows that collisions in SHA-256 are rare. It's a widely discussed theory. You don't h

How would one be sure this guide were safe to follow? Similar to how one knows that collisions in SHA-256 are rare. It's a widely discussed theory. You don't have to trust a single source to tune in to this theory. If the guide is widely discussed and becomes as "common knowledge" as the list of planets in the solar system, you don't have to trust a single source. You can read the discussions about the steps everywhere around the web and form your own opinion.