Time or work pressure.
Not knowing what to expect.
Being unsure of how to prepare.
Hearing stories that create doubt.
There can be lots of obstacles in your way of getting ready for the way. They’re real, they are barriers. You can still be ready, but only you can take the steps to get these things out of your way.
You have to make a small piece of time for yourself. You have to find out what to expect. You can learn what to do to prepare. You can ask for more viva stories that help.
You can and you must deal with anything in your way of getting ready for the viva.