Here’s a primer on decision making (which I learned mostly the hard way)
Make a decision only when there exist two or more options.
I know, that is so obvious. But how many times have you found yourself fussing and fretting about things that are above your pay grade?
Face it, there are some decisions that are made for you and all the second-guessing in the world won’t undo it.
Sometimes the only option you have is to roll up your sleeves and make the best of it. (Preferably without whining and complaining.)