If before your viva you feel an abundance of nervousness, then you have to look a little and find reasons to feel confident. Confidence doesn’t eliminate nerves, but it does help to put those sorts of feelings into perspective. Nervousness recognises that something is important – confidence gives you the self-belief to know that things will be alright.
Look and find reasons. They could be reminding yourself of all the work you’ve done. They could be bound up in realising just how talented you are. Or you could focus on the process of the viva, what you need to do – what you can do – and what that means for you engaging with that process.
There are plenty of reasons to feel nervous about your viva. There are even more reasons to feel confident of success at your viva. Find them.