When your PhD journey is finally finished you get a piece of paper. It will be quite fancy with official words and special ink. One page that says: you did it.
Before graduation, before your viva even, you might need something else to help you believe that you are capable. Kind words and good experiences help, but self-confidence has to come from you.
So take another sheet of paper, probably less fancy, but important all the same. Write down anything and everything you can think of that you know is good about your work: ideas, conclusions, methods – whatever you think makes a difference.
Then realise that all of those things are a part of your work because of you, your effort and your ability.
After your viva you’ll have a piece of paper that shows everyone what you did. Take time before the viva to show yourself what you’ve done.