Confidence takes time and experimentation. There isn’t a set process. Rather than press a button to start an engine, we have to think of it as turning dials and pulling levers on a great, glorious machine. Try something, then check gauges to see the responses.
This is true generally in terms of building or priming confidence, and works too for building confidence for the viva.
- Read your thesis in preparation. How do you feel now?
- Select some clothes for the viva. What might help you feel your best?
- Learn about your examiners. How does that help you feel?
- Find two songs that get you feeling great. Which one works best?
- Reflect on your past successes. Which ones stand out and help most?
You can’t flip a switch to turn on your confidence. You can try lots of things to find it though. Look for the things that help you be at your best, and shine a light on your PhD to help you see the reasons you will pass the viva.