Anyone who tells you the viva is no big deal is wrong. It comes at the end of years of research. It’s huge life achievement. It matters for many, many reasons.
Anyone who tells you the viva is the biggest deal ever is wrong. There’s more you will do, more you can be and more that matters more.
Also: anyone who tells you how to feel about your viva is wrong!
You get to decide how you feel and what it means to you.