Nerdy Will is to appear on screen next month as viewers are introduced to Liberty's family for the first time since her debut on the soap last December.
Speaking to Reveal magazine about his casting, Atherton commented: "I was so excited. It's all happened so fast - I got offered the part on a Thursday, and was filming the following Tuesday.
"All the cast have been lovely and welcoming. It was weird walking into Chez Chez for the first time - I was so nervous. There are guys that have been there for years like Nick Pickard and Jamie Lomas. I just want to be really good."
It is thought that a forthcoming plot will see Liberty's family squatting at the McQueens' house before later deciding to live in a camper van in their front yard.
Asked whether he has felt under pressure to get in shape for the soap job, Atherton replied: "I've never had any issues with my body because I've always been into sport and used to play a lot of rugby. But now I'm in Hollyoaks I should get my act together a bit. I used to be in such good shape, but then I went to drama school and hit the booze."
Liberty is currently involved in a Hollyoaks love triangle alongside her fiancé Ethan Scott and show favourite Theresa McQueen.
> Click here to read our Hollyoaks spoilers