Viva prep principles are fairly simple to share. How you put them into practice is not hard, but it is personal.
Read your thesis to refresh your memory. Annotate your copy so that information is easier to find or clearer to see on the page. Create summaries to help you clarify your thinking. Rehearse to help your comfort and confidence for the discussion in the viva.
Read your thesis – but when do you start? How much do you do at a time? It depends on how big your thesis is, how busy you are and when works best for you.
Annotation sounds good – but how much? What kind of things? What’s best? It all depends on how your thesis is written, what information will help you and how you like things to be organised.
And so on. The principles of viva prep are simple. How you need to do the work is personal. Reflecting on your thesis and circumstances will help you navigate getting the work done.