HC gives some very helpful hints there for scrying. a few things I'll add to it--sometimes it can give you a headache. so if you do feel one coming on--STOP!!! immeditately and put the scrying material away for another day.
also--don't FORCE it. for me, and for many others I know who scry--it took many tries at it before getting anything. when you begin to see a 'fog' or clouds, you know you are close. or at least again, it was like that for me and others i know who scry. I'm not that good at it--I don't do it much. but, another thing that is really good to have on hand is a dream dictionary. you can use that to interpret symbols--it works great for me! after awhile, you won't need to use it, as you'll be able to figure it out on your own. however, till that time, dream books are wonderful and inexpensive.
as with anything else, though. enjoy yourself. if you cannot enjoy it--then don't do it. they still make gorgeous decor in any room!