How can you tell if a psychic is a scam or legit?

One big warning flag is if they are charging or not.
Everyone needs to make a living, but asking for money makes it suspect in advance.

Second thing, is if their reading is TOO good, or TOO bad, especially if they say you are cursed or something and if you pay extra they'll remove it.

They should be able to tell you things with little to no input from you, but don't expect any one to be totally right about everything. Even the Government trained Remote Viewers, the best psychics in the world only had about an 80% accuracy.
Take what they tell you and compare it with what you see and know to be true. It's a good potential source of information, but not the first or the best source of it. =)

Ask me anything