Well, yes, there is. Its difficult though.
I am a psychic and a Necromancer, I speak to spirits a lot. Most of my best friends are all spirits.
Anyone could speak to them and see them, your mind just has to be open to it. You have to let them come to you and not force them.
There isn't really any dangerous with ghosts. Demons maybe, because some may wish to possess you, but not all of them.
The biggest danger is that people may start thinking your crazy, and send you to a mental institute like they did to me...four times... bastards.
But, yeah, you can see them. Theres no trick, they'll come to you. If they don't come to you, thats all right. If they do, thats good too.