Wales hooker Gareth Williams admits he must deliver after winning his first full Test cap in the crunch RBS 6 Nations clash with Scotland at Murrayfield tomorrow.

The Bridgend front rower has been given his chance after veteran Jonathan Humphreys failed to recover from a shoulder injury, pitching Williams in at the deep end as Wales begin their bid to avoid the dreaded wooden spoon.

``I've got a chance tomorrow and I've just got to take it,'' said the 24-year-old forward, who has so far made two substitute appearances for his country.

``It's like a dream - I have gone from playing for my club to making Wales' starting line-up. But it will be very real tomorrow and I've got to go out and perform.

``I wasn't really expecting to start, especially as Humphs has come in and done such a great job, but he has picked up an injury, but I've got to go out and play now.''

Humphreys was drafted in against England two weeks ago following Wales' abject forward display in their Six Nations opener against Italy and the 34-year-old hooker performed with some distinction.

The expected points fest never materialised as Clive Woodward's all-conquering England were restricted to a hard-fought 26-9 triumph in Cardiff, a result which went some way to restoring Wales' battered pride after the Stadio Flaminio debacle.

Humphreys, handed the captaincy in a bid to spark slumbering Welsh passion, led from the front with a powerful display which fully justified coach Steve Hansen's decision to restore him to the team after more than three years in the international wilderness.

And although his contribution on the field will be sorely missed against Scotland tomorrow, his continued presence in the Wales camp has given Williams a timely boost.

``Humphs has helped me a lot. I am still learning, and he has given me pointers with his experience,'' he said.

``He's always talking to me and helping me, and it is great to be able to learn off someone like him. He will be travelling up with the squad to Edinburgh, which is a bonus.''

Wales' next fixtures are against heavyweights Ireland and France, ensuring they must overcome Scotland if they are to avoid finishing bottom of the Six Nations pile.

The Scots, who are also without a win in this year's championship, have collapsed to record victories in successive weekends and their form suggests Wales have every chance of clinching a rare success in Edinburgh.

``We performed a lot better against England. We didn't win, and I don't think we should forget that, but it was so much better after the way we played against Italy,'' said Williams.

``The main thing now is to get a win. You can perform reasonably well all the time, and still lose, but we're got to go up there and do the job.

``It is a must-win game and Scotland are in the same situation as us.''