In taking a solid 2-0 lead over Japan and then holding on against the odds to claim an invaluable point, New Zealand have their destiny in their own hands.
McFarland is playing it cool in building up for tomorrow's defining game.
He is aware Mexico have to chase the game and the win, but he still wants his players to go into the match in a winning frame of mind.
Given that most of the Mexican players are based in the US and play a direct brand of football, he needs his players to be ever-alert and ready to counterattack when the opportunity arises.
"We have to have an attacking mindset," said McFarland.
"But at the same time we need to ensure the balance is right."
Two years ago in Germany, where White, Armstrong, heroic goalkeeper Erin Naylor, Nadia Pearl and Hannah Wilkinson of the current team played, New Zealand failed to pick up a point, going down 2-1 to Sweden and North Korea and 4-1 to Brazil.
But this team has taken a huge step up and is well-equipped for that major breakthrough.
Fifa U20 Women's World Cup
Tomorrow
New Zealand v Mexico, Kobe, 10.05pm (live SS1)
Japan v Switzerland, Tokyo