They’re not being asked to find your weak spot or the flaw in your thesis. They’re not to be dodged or to guard against. You can’t write yourself away from questions with your thesis.
Questions are there to examine you, shed light on your work and explore what you’ve done.
Don’t dread them. Don’t put up a wall. Don’t just hope that they’ll be OK.
Find opportunities to practise, so you can realise that they’re not to be feared. In the viva, pause, breathe, think and answer.