i think explaining a little of the who/what/why helps...
as it can either engage more, or challenge more - both can be good if handled correctly...
it also lets you define things in your own terms...psychic doesn't have to mean all knowing and all seeing if you can explain why...
and if anyone says "eurgh you're a liar, and immoral 'cos you talk to the dead..." - you can tell them to grow up, and thats mediumship, not psychic ability...
"hey mister, if you're so psychic how come you didnt see 9/11 coming?"
"'cos that's not how my mental faculties work...*its here you give YOUR explanation"...
http://www.wonderwizards.com/product_in ... cts_id=447
is a good book (now download)...
