I once found some, what I thought were chanterelles. They looked right, they smelled right and I showed them, quite proudly, to my sister.
"Don't eat them, they may be false Chanerelles" she said "Leave them with me and I'll do a spore test"
I went next day to see the result. "Oh, yes", she said, "They were the real thing (I'd known this all along) and they tasted lovely!"
Some funghi are easily identified but it's always best to err on the side of caution. Get a really comprehensive book and, at first, always show them to an expert. (but not my sister)