I expect nothing

I am doing the centering exercise in Coaching the Artist Within again and now i am focusing on the second breath.

(I expect) (Nothing)

What does this mean exactly? Expect nothing. I have read Zen kōan's about emptying one's cup and walking into a situation without expectations but how does one do this? Aren't we always going to develop preconceived notions about a situation? I will have to think about this further.