The number one factor in why people's sways fail or succeed is luck. No one wants to "hear" it because we want a guarantee, but you have to go in with eyes wide open and say to yourself, "I am going to do what I can do here but then I'll leave the rest of it in the hands of God/Fate/the Universe rather than expending energy and driving myself mad hunting down every possible thing that might sway and beating it into a bloody pulp - because that will sway more blue than any tiny and insignificant detail possibly could".