Regarding The Secret Weapon:
It's a short little video series about how to setup Evernote to use for projects and action lists.
Evernote itself is just a program that saves notes, pictures etc. It supports folders and tags and The Secret Weapon makes use of these features to setup the basic GTD lists.
It won't however help you with your calendar, emails, etc.
Nope, just plain vanilla Outlook. We followed the guide you can download here on GTD Connect. It's very step-by-step with screenshots. It took us maybe an hour to setup the barebones system.
 To make things as easy as possible, I'd go with a program such as Outlook, which has been vetted by the GTD team, and their coaches use it successfully for years. My thinking is, the root cause of a faulty system is either the user or the tools. Since the GTD team went through the trouble of going through an elaborate vetting process, I'd use that, which leaves me with only one point of failure: Me! If I can't make a vetted tool work that the GTD coaches themselves use, the problem is probably between my ears.