Any big project can be intimidating and viva prep is a big project. To do it well, like any project, you first have to look at the big picture, the main goal – but then dig into each step. What will you do first? What will you do last? How much is involved and how will you break that down between when you start and the viva? Focus on getting one task after another done. Do enough, step by step, and you’ll be on track.
The viva can also seem intimidating if you focus on passing the viva!!! instead of remembering to take it one question at a time. You don’t have to answer every question at the same time; you don’t have to answer every possible question that could come up (because not all of them will). Find opportunities before then to practise, use them well, and then take each question as it comes on the day.
Step by step you get to the pass.