I installed it on a live site where I had trouble with enabling https before. I tested on a sandbox site first, just to be familiar with the settings and how to uninstall it quickly if needed. But I was pleasantly surprised when EVERYTHING worked out of the box. This is a multisite, with two domains. Enabling the plugin on one site covered the entire thing. I did find that I had a few “info” notices on Chrome instead of the “lock” icon, which seems to mean that there’s some content that is not secure. So I decided to network enable the plugin, and then I turned on the static content setting for each site. That did the trick. If there’s an easier way, hopefully someone will tell me 🙂 but overall I am super pleased….especially that my site wasn’t down for even a moment.