If you play it by ear, you don't have a plan of action, but decide what to do as events take shape.
http://www.usingenglish.com/reference/idioms/play+it+by+ear.html
If you play it by ear, you don't have a plan of action, but decide what to do as events take shape.
http://www.usingenglish.com/reference/idioms/play+it+by+ear.html