The KO blackjacksite also has an article on KO Rookiee, which really is the fundamental training-wheel version of KO. You can understand it enough to where you can do a little practice and get a feel for it.
If you like it, then you definitely want to buy the book. I forgot to buy it from this site, and grabbed a used copy for like $5 including shipping (sorry Ken). The book is a good read, and goes into more detail.
I personally haven't used the training software, but I'd probably be tempted to jump straight to something like Casino Verite (which I don't have either, but have tried the demo). It supports KO.
I've used KO in the casino for about... twenty or so sessions over a few months, and I like it. My counting skills still weak, and my math skills are weaker, so I really like the lack of mental division.