How to decide to get a nosejob or not?

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I think, from past comments, you're a cis hetero male, as am I. Most of what I say here applies to anyone, but some subcultures or demographics may have sufficiently different beauty and behavior norms as to override other considerations.

Being (more) conventionally attractive has advantages. Being known to focus on physical attractiveness has disadvantages. And most importantly, attractiveness is different for different evaluators. It's quite likely that even if a change is judged as an improvement by your average contact, it can be significantly negative to some important people (your family, close friends who liked you how you were, people you have yet to meet who just prefer natural looks).

This is something you probably can't average out - the distribution and the specifics matter.

I don't mean to argue for "don't do it" - all evidence I have indicates that people who get plastic surgery are happier after than before. I know maybe a dozen people in this category (all women, and more boobs than face, but it's still evidence), and the only one who regrets it (at least enough to share with me) was a case of something going wrong and requiring further surgery and pain to get a smaller overall improvement than expected - she did not believe she'd chosen wrongly.

I do mean to argue that you can collect evidence much more than you've shared here. Asking people can be awkward, but no more awkward than explaining the bruises and talking about it afterward. People and doctors will sometimes lie, but more often will only partly obscure their true beliefs. The extremely common tactic is to tell a few close friends and relatives that you're considering this surgery, and ask what they think. You're not looking for a number or a final result from that, you're looking for general attitudes and specific reaction to your options.

Also, when interviewing doctors, ask for references - they'll be skewed, but still nonzero value as evidence. There _have to be_ subreddits and forums about the topic, and about sub-groups you particularly care about where you can ask (anonymously if you want) about opinions on size of schnozz and on remediation of such. Also skewed, but once you recognize that you don't want averages, but distributions of attitude across groups, that's not too harmful to your choice.

You can also collect some evidence by investing smaller amounts of time/money and seeing if that has any noticeable effect - which may be valuable on their own as well. Pay for a really nice haircut, and hire a personal shopper or consultant for a wardrobe upgrade.

I don’t think “Do I have a big nose” is the right question. Big isn’t necessarily bad. “Would I be more attractive after rhinoplasty?” Yes, some people will lie or avoid the question, so ask your blunt friends who also have good judgment.