Don’t
Don’t make assumptions about why a question is being asked in the viva.
Don’t answer a question without listening and understanding it first.
Don’t bluff, evade or lie.
Don’t hope for a particular finish time.
Don’t expect the viva will be impossible.
Don’t expect it will be easy either.
Don’t go without being prepared.
Don’t discount all of the work you’ve done and the talent you must have.
Don’t forget to celebrate when you’re done.