This is #8 out of 25 Tips to Become More Productive and Happy at Work.
Drop Unimportant Tasks. Delegate or delete the non-essential items from your to-do list. The best way to do this is to always do your most important things first. Somehow, miraculously, extraneous things will fall away.
Scratching things off my to-do list without even attempting to do them feels wonderful. Delegation feels even better, because then the to-do is a to-done without my pinkie finger ever needing to lift.