That particular quintet have been making waves in recent months despite all being relatively new to the international scene and more big things are now expected from them as they return to their clubs for the business end of the season.
But 21-year-old Williams admits that veteran internationals such as Matthew Rees and Stephen Jones, who have for so long been the backbone of the Scarlets, will be the real guiding force on the quest for Amlin Challenge Cup glory.
"Their experience is massive in games," Williams, who scored the solo try that kept Wales' Grand Slam campaign on track at Twickenham back in late February, told ercrugby.com.
"We've got a relatively young side but the experience we've got from guys like Steve and Matthew is really important. We're learning from them all the time.
"Us young ones haven't been in those situations that they've been in big games. They guide us around the park in the matches and they're always helping the rest of the boys out if they need anything in training. We're all learning a lot from them."
The last time Williams and co travelled across the Channel, they returned home celebrating an impressive victory that secured their spot in the last eight of the Amlin Challenge Cup when critics had suggested their chances of continental qualification had passed them by after defeat to Northampton.
The Scarlets dug deep to see of a Castres side who sit fifth in the Top 14 and Williams believes that January's experience will be a big boost ahead of Sunday's trip to the Stadium Municipal.
"I think it does stand us in good stead. It's given us the confidence that we can out there again and get another win," added Williams.
"That was one of my first experiences of going out to France and we managed to come away with a great result.
"We faced a very hostile crowd as they've got great support out there but we managed to get a good win and hopefully we can do the same over in Brive in what I expect will be a really tough game.
"It's a quarter-final of a cup so we are going to take it as a World Cup quarter-final.
"The boys have put a lot of effort in over the last season or two and it would be nice to have something to show for that effort. To win the Amlin would be a great achievement."