"If the plan doesn't work, change the plan but never the goal." Sometimes I do this in the midst of a lesson plan! The fact that my day can be so well-planned and then so unpredictable is one of may favorite parts of the job.
Get comfortable being uncomfortable. Glorya: This is a truism - the very truth of the matter. To be outstanding and a Leader is to be ready to be uncomfortable, be ready to have your judgment questioned all the time and to live outside your comfort zone.