Supervisor Support
Talk to your supervisor around submission time to get a sense of how they can support you when you prepare for your viva.
Your supervisor is best-placed to offer advice and perspective as you get ready. You might not need a lot from them. Maybe you want a mock viva. Perhaps they can share some thoughts on your examiners or the general process of vivas.
Whatever you need, you can be sure that they are busy. They’ll want to help but will only have a limited amount of time to do so and a limited availability as well. So talk to them at submission to get a sense of what they can do, when they can do it and how you’ll make it work.