Fraser and Saints will face United in today's early kickoff.
He told the Daily Echo: "We need to cut out some individual errors. Those happen in football, no one is to blame.
"No one tries to make a mistake. I think everyone needs to realise that. I think they are going to come here to press.
"He's shown us that if they press like this, then we're going to play like this. I think we are ready to face Manchester United."
He added: "If you go into a game thinking that then you've been beaten already.
"If you go in and say 'they're not as good as they were,' I just don't think that's the right attitude.
"And the gaffer won't let us do that here. He showed us clips. Like I said, no stone has gone unturned.
"We're ready for it and you believe that they're going to be the best, so we need to be even better."