I’m life you will be put in circumstances where you will have to try something new in your career.
Do not say you do not know how to. Google, YouTube all of it is at your reach and can teach you basically anything.
You can always learn right there and then.
While you are saying no someone with the equal amount of knowledge as you is saying yes and trying it for the first time too.
The only difference is that they were brace enough to try.
Be brave. Have the courage to try it because you never know what life will bring you.
The effort might give you great news career wise because they see the determination of trying.