The actress will be seen back in her role as dizzy Marilyn Fisher this month as the character returns to Summer Bay after nearly ten years away.
Reflecting on her comeback, Symons told TV Week: "The first day, as I was driving to location, I thought, 'I've got no idea how I'm going to do this'.
"I felt nervous and wondered, 'Maybe I'm too old to go back to this?' but as soon as I had the stilettos on with a little tight outfit, it just came back naturally."
She continued: "When the producers asked me [to return], I was really surprised, but I felt very lucky to be asked. I never thought I'd come back, but then again, I never thought half of the things that have happened to me in the last ten years would happen!"
The soap star also revealed that viewers can expect Marilyn to have the same "bubbly sense of humour and positive outlook on life".
In 2008, Symons bowed out from her role as Emmerdale's Louise Appleton after seven years in the programme.