desperate to root and install/downgrade to JellyBean again on LG G2

hi fellow Droid users! I'm far from being Neo in the Matrix, but i'm way beyond "how do I C&P?"... that said, I purchased a refurbished LG G2 with the intention of rooting and then installing(downgrading to) JellyBean. It's currently running 5.0.1 any help/links to the right rooting software and then a link to (re)install JellyBean specifically would be incredibly awesome! Thanks in advance for taking a moment to read my message and offering any help! p.s... I just want a "stock JellyBean" experience, fancy skins, etc are not desired at all. THANKS!!!!! : )

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