I have the requisite wildcard DNS, separate database, and deluxe hosting. I used the built-in FTP client to upload it to the html directory. When the install would start to work, I would get an "error establishing database connection" and then a 403, 404, or HTTP 500 error screen.
I have single user WP's on separate databases, so I don't think the problem is there. I admit I am dumb when it comes to stuff like this, so please walk me through installing this thing. It is greatly appreciated.