Not That Different
A lot of viva prep – and the viva itself – is not that dissimilar to many things that you will have done during your PhD.
Many prep tasks draw on the same skills and knowledge you have used throughout your research. They are focussed on something different perhaps, but you already have everything you need to read your thesis, annotate it and get ready for your viva.
Success in the viva depends on you continuing to do what you have done all through your PhD journey. Talking to examiners is not that different from talking to your supervisor. Or from responding to questions in a conference or seminar. You have knowledge, talent and experience. You can bring everything to the challenge you’ll find in your viva and succeed.
The viva is different, of course, but not that different from everything else you’ve already done.