Wondering if it's a good idea. If I get to be the GM, I'll have on a sheet of paper thrown lets say 50 green 20 yellow 30 blue dices in advance.... same for the difficulty.... and when the crew decides to do an action that I feel that they better not know the result, I would simply ask what dices do they have, lets says 1 yellow 2 green, set the difficulty and scratch on my sheet of paper the next dice of each color...therefor narrating in consequence without having them knowing if they succeeded with the result.