Re: *tap tap* This thing on?
forestdemon, do you mean mediumship, such as automatic writing or classic seance-style channeling?
i'm fairly certain every tradition/faith of this world warns against doing this without some kind of protection (be it a deity/charm/etc)...you may want to do work with a fetch or servitor first...to get a feel for such things...information on them is rather prevalent on the web so i won't waste your time getting into it here.
unless you're giving full control, you're still going to be aware of whatever is going on, so one can't really use it to escape earthly problems (and any kind of 'possession' is very taxing on both parties)...many spirits wouldn't function well in this world anyway...so you can't just phone up some random dead mathematician to take a test for you......they can't function as you would inside your body.
it may be your common sense not allowing them to take over...or the spirit itself knowing better....i apologize as i'm sounding a bit more objective than usual (been through this road before, i was young and didn't know better lol....nothing bad became of it as the spirit merely had a sense of humor and an innocent one at that....it helped me learn this lesson quick)
and if one did take over...how would you know? your immediate consciousness would be misplaced and your subconscious would be in dream-land...time would lapse (most likely) and you'd wake up with a hangover.....doesn't sound too fun to me; unless it's for very specific purposes.
well i'm done ranting, sorry again...look into voodoo/santeria for some of the better techniques in this field (you'll also notice a plethora of protections stuffs for those that open themselves to such influences). be careful
fade in now into ambiguity, what once mere intangible now my senses align...rather do i myself lose, or is lost the world?