Can Getting Something Like a Nose Job Effect Your Appearance Significantly?

In general, rhinoplasties should not significantly change your facial appearance other than to allow for nasal and facial balance. Your new nose should match your face and look “natural” and not “operated on”.

You have a rhinoplasty because you do not like the way your nose looks. If you and the surgeon agree to an approach, then it may improve your appearance.
 

Rhinoplasty may be the most significant chang you could make to your face. However, a natural nose that fits you face is always best

Typically the nose does not have that type of aesthetic power over your appearance...which is mentioned in my new book.  In cases where the features of the face are aesthetically superior but the nose has flaws that draw attention away from those features...a Rhinoplasty can improve the appearance dramatically but that's very unusual.  Rhinoplasty makes the nose appear more sleek and refined, it will NOT make you attractive if your facial features do not otherwise approach the aesthetic ideal.