THE enjoyment stops now -- we have got to get down to work, says Wales' World Cup star Iestyn Harris as they prepare for a near-certain double whammy against New Zealand and England.

Coach Steve Hansen will probably rest his key players for Sunday's final pool game against the All Blacks in Sydney after Wales made certain of qualifying for the quarter-finals by beating Italy 27-15 on Saturday, scoring three tries to nil.

Then comes the quarter-final against England, the world's number one rated team - though that status took a bit of a battering against Samoa yesterday - in Brisbane a week Sunday.

It is still not 100 per cent certain to be England, but they would have to lose against Uruguay, who would need a bonus point, and Samoa would have to beat South Africa his weekend.

Harris says Wales must follow the example set by Samoa against England and start well, and he also expects Wales to get plenty of support.

"Samoa got their tactics right, their passes stuck and they took it to England," he said.

"England were not complacent. Samoa just got off to a good start and had a bit of luck.

"When you are in the quarter-final there is no room for error. We have got to be as close to error-free as possible and still play an expansive game.

"The media have built England up to be unbeatable, but it's up to us to get the tactics right like Samoa did. They are far from unbeatable, the key is to have a bit of luck you need in big games.

"The game on Sunday did a massive amount of good for the tournament. There have been some big scores, but for Samoa to come out like that with everyone behind them was great to see.

"We've got a lot of Welsh fans out here now and we'll get a lot of neutral support because everyone wants England to lose. England are under pressure, we're not.

"We have got to start well against New Zealand and England, that's what we'll be targeting. There's a lot of work to do to get ourselves right.

"These are exciting times, we're where we want to be and you don't get many second chances. The enjoyment stops now, we've got to get down to some hard work."