All you need to do is:
Set up an Amazon associates account
Find a niche
Write catchy blogposts / reviews in the area of your product
Post the widget (preferably with an image) at the end of your blogpost
The results will vary depending on the items that you are focussing on. Music, for example is not a particularly good idea. Less people buy music than ever before, there's quite a lot of websites that review albums and so it's quite tricky to compete, unless you focus on a less popular type of music. The price of albums is relatively low and as your earnings are commission based, you are better off looking at more expensive items.
So nothing particularly against Skip, I just think that what he's got to say is widely available info, some people act on it and some people don't. It's not as easy as he makes out but it is a feasible form of income.