Questioning What You Are Positive Is True

"A lot of times when you have a problem with your playing and you think you know the solution try the exact opposite.  85% of the time it will work.  And that comes from personal experience." -Marty Hackleman (former horn of the Empire Brass, Canadian Brass and National Symphony Orchestra)

This is invaluable advice for the practice room.  But it is also great advice for band directors and private teachers.  As with anyone who has been doing something for three decades, I know an awful lot about music.  Frequently though, the things which I am positive are the way I perceive them are what hold me back from having a breakthrough with a student or having one myself on the horn.

What is it that you know today that you need to "forget" for a few minutes while allowing the best possible solution to emerge?