That looks like it will be helpful.
If (using the Fantastico interface) I install in a /blog directory am I going to be able to find all the controls I have to mess with on my c-panel?
When I read “open your root directory’s index.php file” it sounds to me like this might be for people who installed by downloading WP and used Filezilla or something and have it all still on their machine.
I hope my question makes sense because it’s based on a very sketchy sense of what I’m doing.