Montemurro and his charges are wiser and more worldly after gathering vital intelligence during the Matildas' two friendlies against Mexico.
The Australians made amends for a 1-0 loss in game one with a dynamic 3-1 victory in Sydney on Tuesday night.
That result, after strikes from Caitlin Foord, Alanna Kennedy and an own goal, pleased Montemurro - but not as much as the lessons learnt.
"There's a lot of positive signs but we know we have to clean things up," he told host broadcaster Paramount.
"And these games are perfect for us.
"Now we have got all this information in regards to these type of teams and now we know how to deal with them."
Montemurro said Mexico's high-pressure style gifted the Australians a glance of what to expect at the showpiece World Cup in Brazil next year.
"These are exactly the games we need: this intensity, this pressure, this continuous 90 minutes of just go, go, go," he said.
Montemurro won't assemble another Matildas squad for another four months - when the next international window opens - with Australia likely to play in Europe against yet to be announced opponents.
But he said the lessons would remain from the Australians often dicing with danger against the high-octane Mexicans.
"It's going to be risky," he said.
"And we just now need to be smarter in finding the moments when we have to maybe play forward earlier.
"But if we don't endorse that and make the mistakes, then we will never be able to solve those problems, because that is going to be the way to solve problems in-game.
"That intensity, that pressure, that way of pressing - we haven't encountered it before and now we know."
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