tcanter:
No one is prescribing choosing where to live based on the gathering of neitzosos. One would need to be steeped in Kabbalah to have access to that knowledge, aside from other spiritual achievements. The discussion of this we are capable of understanding is that we can recognize on hindsight that there were reasons we needed to be where we were at that given time. No, we are likely to not truly understand this, but our belief system and the understanding that Hashem makes the world exist every moment in time with divine and infinite cheshbonos provides us a language to use to explain it. Without the Kabbalistic vocabulary, it is frequent that hindsight enables us to recognize our experiences as having been beneficial even when we could not have predicted it beforehand.
Our responsibility is to make the best choices we can with what Hashem gave us. This hardly includes those matters that reside in domains beyond our grasp. But the hindsight can afford us a better focus.