Sometimes you have to forget that which you know... or think you know.
For us the moment of magic is when we do the move. (or when we see someone else do something sneaky) For the audience the magic happens when we say it does. We can feel so guilty when we are holding nothing waiting for it to vanish. Being a powerful wizard sometimes means taking chances and just letting go of what you are privy to.
It's a hard lesson to be learned but be brave and you will find the audience isn't looking as closely as you might think they are.
Fortune favors the bold...