The defending premiers head to AAMI Park for the clash on Friday night on the back of two losses, conceding a whopping 66 points, while the unbeaten Storm sit top of the ladder.
Maguire has reinforced his leaky left edge and also travelled earlier in the week to ensure his team is on song for the grand final rematch.
Last year - their ninth successive loss in Melbourne - the Broncos lost Adam Reynolds, Ezra Mam and Selwyn Cobbo to mid-match injuries so they have done extra training sessions at the Storm's feeder teams' ground.
"We had a couple of little hurdles there last time we came down with a few of our players, so we just felt it was the right thing to do, come down a day early and train today and spend a bit of time together prior to the game," Maguire said.
"This is another important step for us as a group, a great test in how we want to play and how we want to go about things.
"We're going through a stage where we haven't quite hit the mark on a few of the things that we've looked at so I'm really looking forward to seeing the players get out and do that."
After initially being named, halfback and skipper Reynolds didn't fly south due to his rib cartilage injury.
"I actually thought he was going to be able to play, but he just unfortunately couldn't make the trip down, but he'll be right next week," Maguire said.
Former Storm utility back Grant Anderson is one of the changes to the left edge, named to make his club debut on the wing.
"He's a quality human - the way Grant's come in and applied himself and it's about taking the opportunities and he's now got his opportunity against obviously a couple of his teammates so it's a really important game for him," said Maguire.
Anderson's stay in Brisbane could be a short-term move with the 26-year-old reportedly the Warriors' preferred player-swap nomination as part of Mitch Barnett's shift to the Broncos.
"As far as I'm concerned Grant's a Bronco ... so that's where we're at," said a tight-lipped Maguire.
Melbourne coach Craig Bellamy said any murmurs Maguire's job was under the microscope after their slow start was "ridiculous".
"I would find it hard to believe that the guy that was the coach of a grand final-winning the side six months ago would be under pressure. That's ridiculous," Bellamy said.
He said that Brisbane's shaky form only made them more dangerous.
"They're the premiers and they haven't started so well, so I'm sure they'll be keen to get back to the form they know they're capable of," he said.
"We're fairly happy with the way we've started the season but there's a few things we still need to tidy up."
