Do not anticipate and move without market confirmation—being a little late in your trade is your insurance that you are right or wrong.
The past is always tense, the future perfect.
When making something, always get a few extras — extra material, extra parts, extra space, extra finishes. The extras serve as backups for mistakes, reduce stress, and fill your inventory for the future. They are the cheapest insurance.
The most profound insights in mathematics often come from unexpected analogies.