On The One Hand…
…your examiners are experienced, they have to ask questions, they have to challenge you and they will be prepared for your viva when they arrive.
But on the other hand, you are experienced, you have experience at responding to questions, you can rise to challenges and you can be prepared for your viva when they arrive.
Everyone at your viva is capable, ready and engaged. The viva can be a difficult challenge and you can be ready for that challenge.