If your idea of viva success hinges on your thesis passing with no corrections, then you’re probably going to feel disappointed. A few years ago I asked a lot of people about their viva experiences and only around 10% said that their thesis passed unconditionally. Simple statistics say you’re highly likely to need to do something to correct your thesis.
It’s unlikely you’ll pass with nothing to do, but not unfortunate. It could be uncomfortable or stressful if you’re already busy, but corrections are requested because they’re necessary. They’re not something that only the lucky avoid; despite writing, rewriting, feedback and years of work, it’s extremely unlikely that you would write tens of thousands of words in a book and have it be just right. It’s just one more step in the process from the start of the PhD to the end.
The best you can do is your best. Write the best thesis you can, based on the best research you can do. Do your best in the viva. Then, most likely, do your best after that to make small changes to make your final thesis the best you can make it. Never perfect, but certainly good enough.