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Leinster have already seen off French clubs Montferrand (Pool stages) and Biarritz Olympique (quarter-finals) this season, and will provide one half of a dream Cup final at Lansdowne Road if they can get past an ever-improving Perpignan side.
The other half of the final will be either arch-rivals Munster or yet another French side - Toulouse - but Williams isn't looking that far ahead.
"Don't even go there, mate," the Australian said, laughing. "We've got enough on our plate with Perpignan.
"There are no easy sides left in the competition - Toulouse and Munster are both great sides and we can't do anything about who we meet in the final if we make it that far."
The Cup hasn't been a walk in the park for the Irish province, despite being the only unbeaten side left in contention. Successive three-point wins over Montferrand gave fans a few heart flutters, as did the opening 29-23 win over Bristol and the 18-13 quarter-final win over Biarritz, who attacked the Irishmen's try-line relentlessly in the final few minutes.
"We've had hard rugby right through because we had a very tough Pool," Williams said. "Montferrand are an exceptionally good team and we knew those two games would be pivotal to our chances.
"Because our squad aren't together enough, we've struggled in our early games, like the Bristol game and the quarter-final against Biarritz.
"We've been together the least amount of time of any side in the tournament, apart from maybe Munster, so I'm really happy with the results.
"I think we're playing a good brand of rugby and they players are getting confidence by scoring. Our defensive record is first-rate as well, which is pleasing."
Williams went to France on Friday night to watch Perpignan play Stade Francais.
"They looked pretty good, and they were unlucky to lose. Manny Edmonds had an off-night with the boot, which is unlike him. "Manny is a very, very good footballer," Williams said of the Perpignan fly-half whom he coached in New South Wales.
"I don't think he was given the dues he deserved at Test level in Australia. We were crying out for fly-halves at one stage and he's got beautiful hands and a great kicking game."
Williams says the Lansdowne Road factor will play a part on Sunday.
"It should be another full house, which is good for the team. We're very happy with the draw, but the home advantage doesn't win it for us - we have to win it.
"Perpignan beat Llanelli at Stradey Park, which is a very tough place to win. The advantage for us is that we don't have to live in hotels and on planes. All the guys are enjoying being in their own homes."
