"If ye are prepared, ye shall not fear."
This scripture is so true but there is also another "fear thwarter". It's all about "focusing".
If you are nervous about something -- a dental appointment, giving a talk, an upcoming test, whatever -- you can ease your fears by --
First: being prepared, of course.
Second: by focusing on something that will occur after the feared event.
Such as -- after my operation I will reward myself with . . . .
Or, after my dental appointment I am going to enjoy watching my favorite video.
Or, after I sing my solo in church (this one will never happen to me) it is going to feel soooo good to sit back down in my seat.
You get the idea --concentrate on the reward. Try it, it works.