Did this early on in the game shortly after hitting 50. I went with an FC group and we didn't really have any problems on the first two bosses, but managing the last boss was challenging. Back then we didn't have the DPS to deal with the little Tonberries fast enough so we found a video on Youtube of someone kiting the king while DPS just focuses on him. After the Stalkers came out we did a BLM LB2 on all the Tonberries while PLD hit Hallowed Ground. The rest was history after that.