The Scholars boss has urged his players to enjoy the occasion but not to lose sight of the fact they have earned the right to take on Ronnie Moore's Latics side. And to ensure his players are fully focused on the biggest tie in the club's 51 year history, he will today begin shielding his players from the media frenzy which has surrounded their big day.
"It's been an amazing week, or rather few weeks," Blakemore said.
"When I took over as manager nearly two years ago, I could never have imagined being in this kind of position.
"For myself and for the players, it's a once in a lifetime experience.
"But we need to start focusing on what's important and I don't want the players to be distracted now.
"When we go out of the dressing room on Sunday, I want the players to just focus on what goes on inside those four white lines around the pitch, nothing else.
"We have gone through a real journey to get here and the lads have done me so proud.
"I just want them to go out on Sunday and compete with Oldham. I'm sure they will give me everything.
"We will do everything humanly possible to get a result."
Blakemore, who is expected to have a fully fit squad to choose from, accepts his side will be up against it on Sunday.
But he is quick to point out that his side have been underdogs throughout the competition.
"Let's be realistic, Oldham are seven league above us in the pyramid," he said.
"At this stage of the competition, they are one of the biggest clubs remaining.
"They are a former Premier League side and have been in the FA Cup semi-final three times.
"If we can get anything from the game it would be a phenomenal achievement but that's what we are looking to do.
"If we can keep it tight early on, they may start to get a bit edgy and that's when we will try to take advantage."
Meanwhile, Oldham assistant boss John Breckin has warned the Latics to prepare for a battle.
Breckin watched the Scholars beat Blyth Spartans and was impressed by what he saw.
"I thought Chasetown were the better footballing side," he said.
"They surprised me - one or two of them can really play!
"Church Street is not much different to our training ground at the back of Boundary Park.
"It's really tight and the pitch isn't that good.
"The grass is long, they will probably leave it that way, and the crowd are right on top of you.
"We are definitely going back to grassroots. It's like the old miners welfare pitches.
"It's basic but it is still a tidy little ground. They have done a good job."