What is self-hosting?
You can Export/Download your tour project as a zip file (contain all the images and source code to run the tour), then you can upload and unzip it on your own server. You don’t have to do anything else, just upload and unzip the file on your hosting and it will work immediately.
E.g: you download your project name: “awesome-tour.zip”, after you upload to your hosting under your own domain (e.g: mydomain.com). You can access your tour at: https://mydomain.com/awesome-tour