I saw this Javascript feature tour file today, and was curious how I would go about implementing it on the homepage of a WordPress site.

Ideally, I'd like to add it so it only shows up if and only if a user is on the homepage and have never been there before. I'm new to this though, and I'm not sure how to implement it. I found this previous question but I'm not sure how I would use it in this context. How would I use it on the homepage, and what files would I have to edit?