Answer:
overestimate, overestimate
Explanation:
Nervousness is caused due to the inner mental state of a person being in turmoil. When a person is feeling nervous then in order to combat the nervousness a person becomes conscious of their nervousness.
A nervous person does not want to show that they are nervous. This is the way they think because if they realize that other people are seeing their nervousness it makes them even more nervous. It causes a feedback loop.
Hence, if a person adopts a new hairstyle then they are going to be consumed by the fear of people noticing their nervousness.
So, they may overestimate the extent to which others notice the nervousness. The cause of hiding our nervousness is the result of us being nervous of how others might react to our hairstyle. We may also overestimate the extent to which they notice our new hairstyle.