It didn't take me a year to do the walk-forward testing, it was just a year's worth of data. All the time spent testing took several months. Application of the principles was/is a whole other game. Its amazing how hard it was to simply do what I was supposed to, what I had planned to do.
To be honest, AMT in the diagonal sense is something I've only more recently been incorporating and it has certainly helped add to the roadmap. As I mentioned in the Ghost thread, DBs discussions of boxes (ranges) is what originally clicked with me - lateral extremes.
To answer the question, I have mostly found frustration when my entries are too close to the mean. I find that price is most undecided and I have a harder time deciphering what traders want to do. And I think in many cases, I'm not the only one. The mean often is a point where I see price bounce up and down, and I really have trouble determining which way it will break.
At the extremes, be it lateral (box) or diagonal (trend channel - as was the case this morning), is the location that I am referencing. If you watched a DOM, or time and sales window, or even just your chart this morning, during the testing of that extreme, price appeared to be almost rabid, if traders, from both sides were so eager to do something they were foaming at their mouths.
Niko started a conversation on TL concerning fear, following something DB mentioned in his PDF. You can see that in the tape at these extremes - breakout shorts fearing they'll miss the boat, early longs fearing they were too early, long time longs that think their position is now in trouble, etc. - you can feel it. That is being emotionless and reading the emotions of everyone else and capitalizing on it.
So by location, I mean extremes - this is where price risk is minimal, and information risk is at its highest. But is it really? When traders are at the mean, they are undecided which direction to go. When traders are at the extremes of a range, their most likely course of action, having tested that extreme, is to test the other side. Of course the market cares nothing of your lines on your chart, and could easily fall through whatever you marked as an extreme. But you know quickly, and often with tighter risk that you were wrong. The mean is filled with scratches trying to find a direction - the extreme is right or wrong, and quickly discovered.
[That is just my perspective].