As stated above, Sean has everything you need and top notch support to help you through.
The basic tuning, changing only fuel loading at 250 RPM increments based on logging runs in 3rd gear, is not as hard as you might think. Sean will walk you through it. Before starting the log runs, you should set your fuel adaptives close to zero. That's another step, but again not very hard to do. Sean has the tool for this as well. I have never touched the spark. Advanced guys in here and the other board know how to manipulate both to stay on the edge. I'm quite satisfied with the results I've obtained. We drive our car a lot. I wanted a good safe tune so as not to be to lean and/or worry about detonation--especially with my cast pistons.
I'm not going to argue with the dyno only guys, but I think making a few cards over varying temperature ranges is a better way to go than the dyno.
I believe Sean will be releasing a IAT component to the VEC2 pretty soon which may negate the need for multiple cards. Until then, a card made in a dyno shop at a particular room temperature will likely be too rich in excessive heat and too lean when it gets real cold (40 degrees). I can't speak to how water/meth effects this equation. I have been told it's a little trickier tuning with the water meth. Also, as regards not getting the water meth kit, I didn't want to give up the trunk room either. We travel a lot in the summer. You can fit a lot of 'stuff' in that corner.
Steve