Only celebs and start make the first impression. For rest of the humble mortals it's not always that we make an impression in the first impression because you don't even know whether the one whom you are trying to impress is even bothered to be impressed or his/her mind is preoccupied with that serious attack of heartburn.
Not always. I've had my mind changed a few times.
Usually true. But I think your opinion can change if you get to know that person
It shouldn't be.
Not if it's a good one.