There are lots of people who can help with your viva preparations, but the two most useful groups are your supervisors and your colleagues. They can provide similar kinds of help with unpicking the research you’ve done, but they have different restrictions.
- Your supervisors can give you depth of thought and feedback, but they are probably very busy.
- Your colleagues may have great availability, but won’t have deep knowledge of your thesis.
So you have the trade-off, availability versus depth: you have to decide what will help you most.
If you need real detail, then you probably have to get help from your supervisors. So you might need to plan in advance how and when you’ll get help. If you really just need someone to listen, and your supervisor is time-pressured, then perhaps you can lean more on your colleagues in an ad-hoc way.
There are lots of things you can ask for from supervisors and colleagues. And you can use both groups to support your preparations, you don’t need to cut anyone out! As you submit your thesis, think: What’s left? What do you need? Who do you need?