If multiple prevention and/or replacement effects are trying to apply to the same damage, the controller of the creature that would be dealt damage chooses the order in which to apply them. As examples, an opponent could choose to apply the effect of Djeru’s Resolve and prevent the damage rather than put -1/-1 counters on it; or an opponent could choose to convert the damage to -1/-1 counters before Insult could double it, and then Insult’s effect won’t apply anymore.