The most impressive Irish display came against France in Dublin in round two when Farrell's men ran out 32-19 winners in an epic battle between the world's top two sides.
Beating the holders felt big, but defeating England to deliver a Grand Slam in Dublin for the first time brings even greater pressure, and Farrell has called on his players to show calmness in the midst of the "circus".
"All this stuff that you guys [the media] are going to be writing, it all becomes part of the circus, you know, managing all that," he said.
"But in reality, anyone who has ever played in a big game, when you get over that white line all bets are off. It's business time, isn't it?
"All the emotion gets taken out after the first five minutes anyway and then you've got to be at your best.