I think its pretty comparable to hair transplants, or any other cosmetic surgery. Nothing wrong with getting it done, just be sure its not an impulsive decision, and make sure its something you seriously truly want and if your current nose has been bothering you for a long time.
Also with HT's, I'm sure doctor selection is key. Plenty of botched nose jobs out there just like with HT's.
I'm no expert in nose jobs but botched nose jobs are probably much harder or even impossible to hide compared to botched hair transplants. Not sure how you can conceal or style your nose to hide a bad surgery.