"I'm pretty confident we can do what's required on Saturday ... it's finals footy, you have to be confident."
A former Waikato Development team player, Johnston is in his first season with NOBM after playing for Napier Technical last year.
"NOBM is similar to the Fraser Tech club I used to play for in Hamilton. It is a good club with a good environment."
When he first arrived in the Bay last year Johnston was keen to secure a berth in the Magpies squad but this is no longer a priority.
"I'm just keen to be playing good footy for NOBM. I'm pretty busy with work and when I'm not playing or training for rugby I'm into crossfit."
Three weeks ago he competed in his first crossfit competition in Hamilton and won his one-year-plus division.
"Crossfit certainly helps my footy. I notice the benefits during the last few minutes of a game," he said.
"Doing crossfit will help keep me playing footy for several more years. I just don't know which position to focus on now."
A stock agent for Ross Dyer in Bay View, he said rugby often features in his conversations with farmers around the Bay.
"It's pretty hard to find a farmer who isn't into rugby," he added before his next farm visit beckoned.