I feel the most important factor when you are in a big Tournament, is do not let other players dictate what you have to pay for being in a hand, Even when you have a good starting hand Like A/K suited or A/Q suited, Sure it is nice to see a flop with, but be prepared for future bets and raises during the hand if you miss your Flush or better yet a Royal Flush.
If you are not 100% sure that you want to gamble then do not call any raises by other players, because inevitably the will be holding a massive Pocket Pair Like A/A or K/K It's the Nature of Players who regularly play big Tournaments, "Raise with the Best, Call to Invest, Fold all the rest" is a good Mantra for big Tournaments,