Surprise Scotland call-up Scott Lawson is determined to take his chance after being selected to face Wales on Sunday.
The RBS 6 Nations Championship starting debutant will replace Dougie Hall at hooker for the match at the Millennium Stadium.
The Edinburgh Gunners man was viewed as a weak link in the team which defeated France 20-16 at Murrayfield on Sunday, with a number of line-out throws not reaching a Scottish jumper.
Scotland head coach Frank Hadden has omitted Hall from his squad for the trip to Cardiff with Ross Ford of Border Reivers on the bench.
But, while Lawson, who has earned five caps for his country including a substitute appearance against Les Bleus, was disappointed at missing out last weekend, the 24-year-old Glasgow hooker is relishing the chance to prove himself at the highest level.
Lawson said: "I thought it would be very hard to change a winning team.
"So I was delighted to get selected and I'm looking forward to Sunday now.
"I certainly wasn't expecting it. Since I have been involved though, I have learned to expect anything.
"It must have been hard for the coaches but I'm delighted to be involved this week.
"Frank has always said the squad is there for competition for places, which can only be good.
"It bodes well for the whole tournament that we have those selection 'problems', especially in the hooker position.
"There are three guys Frank thinks can perform in the Six Nations and we will try to put in the best display we can.
"Our line-out didn't function as well as it could have done at the weekend. It is definitely a strength for us."
Scotland have forged a formidable reputation at the line-out in recent years with players such as lock Scott Murray consistently securing good quality first-phase ball.
But Lawson concedes the set-piece can prove to be a double-edged sword.
He added: "There were a few mistakes on Sunday and, hopefully, we will fix it this week.
"It is hard because there is a lot of movement and our driving maul from the line-out was really good against France.
"The best way to achieve that is a full-man line-out but, obviously, by doing that, it gives the opposition more chances to compete."
The 2017 RBS 6 Nations was watched by record numbers of fans
29 March 2017, 12:25pm
After an enthralling RBS 6 Nations Championship of twists, turns, and no small amount of drama on the last day, figures show the RBS 6 Nations is going from strength to strength, year on year, with no sign of slowing down.