Ryan O'Shaughnessy has admitted he has a "mammoth task ahead" as he prepares to represent Ireland in the first Eurovision Song Contest semi-final on Tuesday, but says he thinks he's "on the right path" for success in the competition.

Speaking from Lisbon where he was gearing up for the first dress rehearsal on the Eurovision stage, the singer-songwriter said he was feeling "really good" about the jury vote, which took place on Monday.

Ryan O'Shaughnessy and dancers Kevin O’Dwyer and Alan McGrath on the Eurovision stage

"There’s a big Irish flag on the wall, I’ve got my friends around me and I’ll be representing my country", he said. 

"It’s only kind of dawned on me now in the last few days, the mammoth task ahead and how important it is for Irish to succeed this year in the Eurovision, but I think we’re on the right path."

The official opening ceremony for this year's contest took place on Monday evening which was attended by press from around the world and hoards of fans. 

Veteran Eurovision commentator Marty Whelan also joined the Irish delegation at the event, and Ryan said it's been "great" having Marty around.

Marty Whelan and Ryan O'Shaughnessy at the Eurovision opening ceremony

"It’s his 20 year anniversary of coming to the Eurovision, so he knows a lot of people. He’s been introducing me to a few heads and he’s been giving me a few tips as well, of how to cope with the nerves and all that type of stuff.

"But to be honest with you, I don’t really feel too nervous because I’ve got great people around me and we’re all feeling confident in our performance. Today is the jury’s vote which is 50%, so today is as important if not more important than tomorrow.

"We were all good last night, we had early nights, good sleeps, so we’ll be on top form!"

Ryan said it feels "energizing" and "emotional" to step out onto the Eurovision stage and that he is relishing the opportunity to represent Ireland on a world platform.

"I’m super honoured to be asked to perform for my country, it’s not something that I take lightly and I’m going to go out with the energy and support of all my Irish brothers and sisters and do us proud", he said.

Ryan with Mikolas Josef who is representing the Czech Republic with Lie To Me

The Britain's Got Talent star added that his uncle Gary O'Shaughnessy, who represented Ireland in the song contest in 2001, is arriving on Monday evening to support him.

"My uncle Gary gets here today so I might see him tonight. I know there’s a lot of super fans from the Eurovision looking to see him too so he’ll be a little celebrity walking around Lisbon", Ryan said.

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Tune in to watch Ryan performing his track Together in the first Eurovision Song Contest semi-final on Tuesday May 8 at 8pm on RTÉ 2.

Eurovision Semi Final 2, Thursday, May 10, RTÉ2, 8pm.

Eurovision Grand Final, Saturday, May 12, RTÉ One, 8pm.

Take a look at our top predictions for Eurovision glory here.