Wales interim head coach Rob Howley has urged the public to give Biggar time but the 23-year-old insists he is ready to carry the weight of a nation.
"There's a lot of pressure, it is part of the job title. It's a difficult position to be in," said Biggar.
"So I could give you the routine answer of you just get on with it and you don't pay any attention to it... but of course you do.
"You are aware of the Welsh 10 jersey and the expectation around it. As a player, when your team is playing well, it's a great position to be in, but when things aren't going quite as well as you would perhaps have liked, that's when you come under scrutiny.
"As a 10, especially in Wales, that's part and parcel of the job. You have to take it as it comes, but you also have to enjoy the high bits as well, when you are playing well and winning.
"I don't think there is any hiding my international career has been a bit stop-start and I hope to get it going this weekend against a good Irish side.
"The Six Nations tournament is the best in the world, in my opinion, and it's something I'm really looking forward to.
"I would like to think it's my best opportunity to put a marker down and go from there."
Wales go into their Grand Slam defence on the back of a seven-match losing streak and Biggar, who will earn his 12th cap, insists winning far outweighs his personal performance.
"It's the opening match of the campaign and, more importantly, we, as a team, want to get off to a good start," added Biggar.
"Obviously it helps you do that if your nine and 10 are playing quite well.
"If I can do my bit to get us on the front foot then it will be happy days but it's more important to stress Wales get off to a good start rather than the talk be about this 10 jersey.
"If I don't have a particularly good game but we win, I will be happy."
Howley has declared Wales will play an attacking brand of rugby throughout the Championship and Biggar is excited about the prospect of reigniting a star-studded back-line that includes Jamie Roberts, George North and Leigh Halfpenny.
But he is wary of the attacking threat Brian O'Driscoll and company pose.
"I would like to be on the front-foot, playing inside, outside, making breaks but it's very difficult to say how the game is going to go," added Biggar.
"It's something I have worked hard on to develop more in my game and is something which, hopefully, will stand me in good stead if needed at the weekend.
"But we are fully aware of how good a side Ireland are. Sexton, O'Driscoll and D'Arcy have played together God knows how many times for Ireland and Leinster.
"They're a pretty good unit to try and break down as well. We fully respectful of how good Ireland are and we have to be up for the challenge collectively and as an individual."
You can follow all of the action for Wales v Ireland at http://www.wru.co.uk/live