Assistant coach Richie Murphy (right) sees "a lack of confidence" in Leinster's attack, at the moment.
"We're obviously not firing on full cylinders," he said.
"I think if we think about why we're not scoring tries it's not going to help us.
"It's about getting the process right and making sure those little individual parts are right, that, individually, we bring the right intensity, make the right decisions and play to play really well rather than not to lose the game."
There will be no sensitivity around the mistakes made and the penalties conceded in the review room.
"They're all big guys. They know as well as anyone else where they were good and where they were bad, so the one thing that's always been the case in Leinster rugby is that the players take ownership of the performance they put on pitch.
"Like the coaches do, and I suppose like everyone in the environment, none of us are really happy with how we played at the weekend and everyone is striving to try and fix that."
The one area that needs most attention is the scrum where Leinster were undermined and overpowered by Harlequins.
Conor O'Shea's men could take the momentum from the set-piece into The Aviva Stadium as one French referee, Jerome Garces, will be replaced by another, Romain Poite.
"We've another French referee at the weekend and they tend to ref the scrums with whatever side has the momentum.
"It's a tricky situation. We got momentum sometimes during the game, they stood up and we didn't get the penalty. It wasn't tit-for-tat in that way."
Scrum coach Marco Caputo and the front row union will have to play the part of problem solvers, or Leinster could be in for a rough ride from Monsieur Poite.
"Marco is working with the guys, who are a little bit upset about how that aspect of the game went, so I would definitely think the guys will be ready to go this week to try and paint some better pictures."
On the injury front, Gordon D'Arcy's scan to a tight calf came back clean and flanker Dominic Ryan should also be able to throw his hat into The Aviva ring, while wing Dave Kearney and hooker Richardt Strauss are touch-and-go.
"I think it's definitely a must-win and I think we need to try and get a four-point spread in the game.
"But it can't be the only thing in our minds.
"We need to work out the best way to go about getting that four point spread and deal with the process and let the outcome look after itself."