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What is your favorite "rule of thumb?"

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In cooking and baking: you can always add more heat. You can't take it out. Same thing with ingredients: you can always add more, you cant (always) take it out. So taste as you go.

JCSpark

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Very simar to measure twice, cut once. Unless you have a biscuit joiner, that is...

mack7400

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For me, it's like

measure twice
cut once
swear
get more material
measure thrice
creep up on the measurement
swear louder
get more material
cut cut cut
cry
fish the first cut out
make it fit