Yes, the video is accurate.

If your movements are repeated on every screen it's because you have Repeater turned on and the whole purpose of repeater is to do exactly the same thing in every window (you generally want this off). The video turns repeater on to enter password and enter world at character select, but then turns back off for gameplay. If 1 through = dont automatically auto-assist and broadcast, then it's likely that either Key Maps are off (e.g. from entering your password, this gets turned back on in the video when repeater is turned off), or the ISBoxer Addon is not enabled (at Character Select, this is not something you download it's created when you Export). If your guys follow the wrong character, then they're probably mis-matched to the game windows; this is fixed most easily by closing out the game, doing a File, Export (click Yes when it wants to fix your account names in config.wtf files), then re-launching the Character Set.

p.s. this is all in the WoW Quick Start Guide that Fenril linked. There's a list of hotkeys, a walkthrough of the login process (explaining what happens in the video, basically), an explanation of key maps vs repeater, the Beginning Gameplay section helps you make sure the ISBoxer Addon is loaded and working, "Interaction with NPCs" helps you set up Interact with Target when you discover you want that, there's a section following that to help you set up lots of broadcasting hotkeys with optional auto-assist, and so on.

The Quick Start Guide is the single most important thing for you to read in the first 30 minutes of use, which is why it's linked everywhere including several areas within ISBoxer (like when you first launch it there's a big header "New to ISBoxer?").