What I love about this song is that it glories in "not knowing." I don't know how I got over, in fact I look back and wonder. But the orientation of the song is instructive. You see the singer is on the other side of the problem. The singer is not in the midst of the mess, but she is on the other side looking back.
Another thing that is interesting is that the singer was there before "getting over" and yet can't figure out the process of "getting over." This reminds us that we may be in the midst of overriding conditions and yet if God has the last word, we don't have to see our way out. God will take us out even if it is in such a way that we can't even see the "taking out" happen. We may not even be able to see God's doing it.