I find them fascinating too and have intended to learn more about them for a long time, but have never had the time so far....it's like grasses. I'd love to know all the different types of grass but as someone said to me recently "I've always said I'll learn grasses when I retire".
When I read through the introduction to one of the fungi books I have, it also says you should find someone who knows to point out the edible and poisonous and their characteristics.
Oh well...I can't eat my tawny grisettes but they look so pretty growing in the shadow in our mini-wood that I don't really mind.