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I feel like an epic poem and a set of instructions would both be bad with a conversational tone. An epic poem most likely has a less conversational feel to it. A set of instructions generally must be concise or serious. If you're reading instructions, you don't care about whether or not the narrator/author is trying to be nice. You just want to know what you're doing. Therefore, I'd go with a set of instructions
An epic Poem, I agree with @heretohelpalways; a conversation would not suit reading an epic poem at all, as it requires feeling and emotion and that's not always something that regular conversation can contain.
I'm pretty sure it would be a set of directions. I mean, do you read a manual on how to assemble a bookshelf wanting to read something like: "So yeah, you know you should just take that one piece and nail it to the other, oh and how was the game anyway?"