Wales' record try-scorer Shane Williams says his country are "still trying to find their feet" ahead of Sunday's Guinness Six Nations opener against Ireland.

The countries met in November in the Autumn Nations Cup, when Andy Farrell's men won 32-9 at the Aviva Stadium. 

It's been a difficult year for Wales head coach Wayne Pivac who needs a performance this weekend to ease mounting pressure on him.

Former wing Williams believes the potential is there for his compatriots to silence the doubters in the spring but he admits they have issues. 

"Wayne has definitely got the firepower within that team to do very well," Williams told RTÉ's Game On.

"He's had a tough time. He was building for the future, building for the World Cup, blooding a lot of players.

"The public were like, people aren't having enough time to solidify their place. They're having one cap, then they're being thrown out.

"I think we went through four or five scrum-halves during the Autumn Nations Cup series and we still don't know who our number one choice is.

"Things like that are really difficult going into the Six Nations."

Williams did defend Pivac, pointing out there has been some signs of improvement. Ultimately though he expects an Irish victory at the Principality Stadium. 

"He's been up against it definitely. The Welsh team did get better as the autumn series went on and we finished quite strongly and looked pretty good, but in terms of where we are as a squad, England, Ireland and Scotland are above us.

"I do think [Ireland] are more advanced in the way they want to play and are far more comfortable in the way they want to play. Wales are still trying to find their feet." 

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Follow Wales v Ireland (kick-off 3pm) on Sunday via our live blog on RTE.ie and the News app or listen live on RTÉ Radio 1's Sunday's Sport. Highlights on Against the Head, Monday at 8.10pm on RTÉ2 and RTÉ Player.