"Earlier this year it was physical but still to this day it is mental," Tamou said. "Going into a game, so much goes through my mind with each hit-up and each tackle.
"With each game I need to get a hit-up early to get a feel for the game and know I will be right."
Still, Tamou could appreciate how far he had come.
Tamou said a fortnight before the NRL season kick-off he couldn't even lift weights. Yet somehow he made the Cowboys' round one team.
He hasn't looked back since - and it has nothing to do with his stiff neck.
"I am shocked and surprised, very fortunate to be here," said Tamou of his Kangaroos call-up.
"I was struggling at the start of the year. I thought I was no hope of playing rep footy, no hope of getting anywhere.
"I actually thought I would struggle to make the Cowboys side.
"There is still a bit of soreness and stiffness in the neck after each game but that is normal. I have come to terms with that."
Despite the hurdles he had cleared, the 113kg Tamou still sounded fazed by his latest challenge - a Kiwis pack that revel in reminding him of his heritage.
"They have some big boys and are a very mobile pack - it is pretty daunting," the 10-test prop said.
- AAP