It is impossible to provide guarantee if you’re talking about an operation performed by a person on a unique Live organism. None of the surgeons guarantee throughout the world (if not a charlatan).
Average success of the nasal aesthetic in the world is about 90%. So a 10% revision requirement is still present.
In my personal opinion, what’s important here is; your doctor should not leave his/her patient in the event of any kind of negativity, must correct any complication developed in connection with the surgery or help to correct.