Look back over the progress of your PhD journey. Your progress.
Realise that there is something new that now exists – and the only reason it does is because you made it happen.
Prepare for your viva carefully, invest time to make sure you are ready and confident.
Listen, think and respond to your examiners; make the most of your viva.
And when all of that is done, take a moment to think about what you take with you beyond your PhD. When it is finished it’s not the end for you and who you are now.