You shouldn't have to download his video. You can just watch in online.
It's not very hard to do.
There are three bolts to remove with covered by two plastic plugs. The door switch panels just pop up and there are wire connectors that can be unplugged. I'd suggest getting plastic body tools to use for popping everything up. They'll save your fingers and a lot of the mounting pins/plugs.
If you can't view the video, let me know and I'll take some pictures tomorrow. I've had my panels off 10+ times.
Go to 1:48 in the video for panel removal. Also, you won't need to touch the Molex just to do Dynamat.
Video #2 Audio Install in a 2009 370Z on Vimeo