The Sitecore Commerce installation really puts SIF through its paces, and a number of things can go wrong along the way. Having a clear sense of what the script is doing, how it is structured, what the bumps are, and how to pick thing up after an error can make a big difference, so I thought I'd share my experiences. These notes are based on the Commerce 9.1 installation, though I touch on what has changed since 9.0. I hope to look at the recently released 9.2 installation process in a future post.