In this case, the risks should be very low - the worst that should happen is that it will fail to work as you hope. For extra safety, ensure you have a couple of good backups of your Lightroom catalog before proceeding.
The fragility is more that the plugin might malfunction because it is doing things that the Lightroom Classic plugin API was not really intended to do.
Like many of Jeffrey's plugins, the configuration options look daunting. However, the number of options is because of the power. Typically, a handful of well-chosen settings will get you going. Perhaps the most awkward plugin of his to get going is the excellent geotagging one, and that is only because of the lengthy process of obtaining a Google API key (understandably Jeffrey will not pay the Google charges incurred by use of a donationware plugin).
So long as you have all the collections you wish to export under a single collection set, I would configure Collection Publisher by specifying a folder you want the images exported into, then follow the
mirror instructions. Set the export options and that should be all you need to get things going. I would leave all the other options alone until you see how well it works.
If you aren't happy with what happens, you can always delete the publish settings, wipe the folder of exported images and try again.