Nehemiah began with repentant prayer and soon the hand of God was upon him. It is much easier to see the effects of own's own sin and the sin of one's fathers when everything held holy lays in waste and it's defensive walls are burnt to the ground; easier when one is serving his captor hand to mouth. Too bad that it often has to come to this before we see our sin and it's consequence. The pattern of revival is always shown to begin with repentance, receiving the hand of God, and then the valor to stand against everything that opposes.
There is a good amount of information that we are left to assume about Nehemiah. That fact that a Hebrew, any Hebrew, would be trusted as a personal cup bearer in any foreign king's court says a wealth about Nehemiah's character and integrity. The fact that the king would grant such a request to a Hebrew at this particular time says much to the strength of their friendship. The fact that the king would trust Nehemiah's abilities as a leader of this project say's much about his apparent leadership abilities despite him being utilized up to this time as a cup bearer (and to provide him much of the resource?). Add to this the fact that several of the tribal leaders of Judah had enough confidence in Nehemiah to commit themselves and their own limited personal resources to this extremely dangerous and volatile objective, simply put Nehemiah must have been very well known and very well respected even before the hand of God came upon him in this bigger way. The remnant risked being outed in a irreversable way.