I wish for your viva to be long enough to be interesting, but short enough to be not too draining.
I wish for great questions and helpful corrections.
I wish you confidence: you’ve earned your place and you have the talent to meet any challenges in the viva.
The first two wishes are realistic expectations, given the whole process. The last one I can wish for you, I can hope for it, but you have to work at it too. Your confidence is not just a hope, and it’s not so magical that you need to only wish for it. If you’re doubting yourself, you have to take the first steps to realising a more confident you.
What will you do?