Nosey?
I was thinking along those lines too. But I can't get anything to quite fit.
Sticking your nose in other people's business.
Putting one's nose in the air.
Cut off your nose to spite your face.
Maybe, it's a plain as the nose on your face. I think that may be it.
Sam,
I think number 29 is 'don't jump to conclusions' I originally thought the cart before the horse, but it doesn't really work. 'Don't jump to conclusions' sort of puts the end at the beginning.