I am really afraid when alone in the dark. I guess my state can be described as controlled panic, lol.
It does not help that I am in Norway, where the hills are full of trolls, goblins, vettir and hulderfolk. But the knowledge that the fear I am feeling is just them using their magic to make you leave
their land alone is comforting. So just offer them som butter, milk or beer (traditional) and they leave you alone. Also they can't touch you on cultured land, as that is not their domain. A fire will also help,
and as a last resort, show them steel, as it's magical properties will render their spells useless.
Should you get them inside your house thats another matter. A husnisse for example will never leave. He will even follow you if you move. So leave steel by your door (a horseshoe is popular, just hang it the right way, so your luck does not run out), to prevent them from coming in. Ghosts are easy to get rid of,. Just trample 3 times and say: get out! with a loud voice and they leave.
Oh and when you toss your wash water or hot tea water on the ground, it is polite to warn the vettir, so they don't get scoldet or wet. Just tell them politely to move. Same when you arrive at camp, just tell them that you will camp there, and how long you intend to stay. And leave at the agreed time and you should be fine.
If you need more advise, don't hesitate to ask, personally I love the midnight sun....
You don't believe in trolls you say?
[video=youtube;TLEo7H9tqSM]https://www.youtube.com/watch?v=TLEo7H9tqSM[/video]
(this has been an education in Norwegian folk beliefs. You may or may not treat it as a joke...rest assured the trolls won't)