Need help installing W valleys in 3' metal roof panels

I am reroofing my house with 3' metal roofing panels and need advice on how to install 2 valleys using 20" w valley.
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What specifically are you asking? Lay down some ice and water in the valley, lay the W flashing on top, cut your panels so they stop short of the center rib. You don't say what type of metal--standing seam or ag steel.
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