Led by Paul O'Connell Munster will need to better the resilient, rearguard display that saw them see off English champions Harlequins in the last eight if they are to reach a first final since 2008.
And while Ireland international O'Mahony admits there is a nervous tension at the club, he is adamant the players will be ready for the challenge that awaits them.
"I've been lucky enough to play international rugby against the All Blacks so there have been plenty of teams I've been involved against that have been hyped, so there's nothing new there," O'Mahony told the Irish Times.
"Obviously they're a hugely impressive team but when you bring international rugby into it there's obviously a different aspect.
"It's nerve-wrecking at times when you get some of the pictures up on the blackboards.
"You get a bit nervous, relax again and then get to training and something goes wrong in the defensive line and you start to panic a bit but I suppose that's all part of it; this is my first semi-final and I'm hugely excited to get stuck in.
"Sometimes it feels like it is a short week, sometimes it feels it's for ever but I'm getting through it.
"Fellas want to do well and as you guys know we measure ourselves on the Heineken Cup, that's a huge week for the club and especially for what is a new group that we have here."
Guinness PRO12 Munster News
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