When I first got into my buell I did the same thing you did, the ECMspy cable seemed a bit overwhelming, but it was cheaper than a race ECM, So I went with ECMspy cable.
At first, I was completely lost, but after actually reading steves tuning guide, and finding a couple of users ecm maps, I had a starting point, and worked from there.
For example, get the cable and download the Buell Race map rather than buy the ecm, plus you may enjoy it and feel a little more pride in learning that part of your bike.
I still have a lot to learn on logging and tuning but I found all the info from this and a couple of other message boards.
I promise you when you are with your buddies on their Jap bikes, and you pull out your laptop and tune your they will be impressed.