Pre-finish everything but the ends and let it cure. Scribe and cut each piece as you go and put finish on the ends and just nail it up. End grain will soak up the finish in seconds if you use a water based finish, not sure about solvent based. I kept a little finish in a can that was basically empty along with a foam brush that fit inside. I just kept adding finish to the can keeping it about an inch deep. Nobody sees the ends of the boards anyway, so appearance doesn't matter.
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