i can only speak of a general nature
in general you want to ground yourself as step one, and as step two charge up yourself with the light and surrounding area as step two. that is what i do when i read the tarot cards..
the yes yes board is a differnt beast as for it to really work you have to open yourself to spiriits who are around for it to work.
of interesting note 2 of the spiritual teachers who have come through did so first through the board,, orin for sanaya roman,, and micheal teachings through the board ..
and seth , the guide for jane roberts
"Another famous Spiritual entity who first appeared by means of the Ouija board called himself “Seth”, who first made an appearance when Jane Roberts and her husband first began using a Ouija board in 1963. The entity eventually introduced itself as Frank Withers who died in 1942 after his most recent physical life as an English teacher. He preferred to be called “Seth” and stated his mission as helping people to understand themselves and reality better.
Through Jane Roberts, Seth dictated several best-selling books dealing with the nature of reality, reincarnation, Astral travel, dreams and the nature of God. Seth also provided step-by-step teachings on meditation techniques and extra-sensory perception. He was also able to diagnose illnesses, correctly describe the contents of buildings and rooms many miles away, and materialised as an apparition in well-lit settings. "
from
http://www.ourultimatereality.com/the-ouija-board-and-its-hidden-dangers.html
the psychic circle board was like the oujia board but was supposed to be more postively charged.
http://www.amazon.com/Psychic-Circle-Amy-Zerner/dp/0671866451
if i recall correctly with the ouja you can ask the planchetee to go towards the spirit alignment to astertain if it was from the light.
i hope oujia boards users if any , who use the board can answer your question better..
if not perhaps this
http://www.theastralworld.com/occult/how-to-use-a-ouija-board.php
http://www.theastralworld.com/occult/ouijaboardtips.php
http://www.greatdreams.com/ouija.htm