The viva is a discussion driven by questions from your examiners. Every question is an opportunity for you to share your work and show your capability.
Every question is an opportunity for you to demonstrate what you did, what you know or what you can do. Every question is a step closer to finishing and passing.
If any question causes you to stumble, to freeze, to forget, then you’ll be alright. Another opportunity will present itself.
Every question is an opportunity in the viva, but there will be far fewer questions and opportunities than those you’ve already answered, responded to or made the most of on your PhD journey. The viva itself is one more opportunity to learn, grow, develop and show your ability as a researcher.
So make the most of it.