You might be looking to appoint a couple of people to the position of “Viva Prep Helper-Outer”.
What do you need from others to help with your viva prep? What are you looking for?
Think about it and make a decision. Find out who is available. Think about what they know and what they can do.
Make it clear that it’s a low-paid job, but you might be able to manage the odd coffee by way of compensation. Essentially the position is somewhere between a coach and a consultant. You want questions, ideas, advice, encouragement and someone to listen.
You might need to take on more than one person.
Don’t be too demanding on anyone’s time, and remember to settle up with anyone who is a really big help.
Say thank you when your viva is done, and be ready to help someone in the future.