1. Accept that there will always be people who won’t like your writing.
No one person is the same and so not everyone shares the same tastes as you. Someone who hates your preferred genre of writing is probably not the best source of constructive criticism and so move onto someone who can offer relevant and informative advice. There’s always going to be that one negative person who will blindly criticise everything you do, without offering any motivation or notes as to what has been done well.
2. Don’t seek out criticism unless you are prepared to hear it.
Writing can become extremely personal and mean a lot to you - and so to listen to anyone tell you they don’t like a part of it can really hurt as it feels like they don’t like a part of you too. Perhaps first show a group of close friends who can offer basic reader advice (ie. I enjoy it or I don’t enjoy it). Then when you’ve built up your confidence, move on to those who can offer real writer evaluation, which can sometimes sting a little more.
3. Try not to finalise the novel in your mind.
You may redraft and redraft endlessly until you believe you’re finished but to submit that one statement as being valid in your mind, “Yes, I have finished” leads you to less courteously accept criticism. If everyone who reads a certain chapter of your work finds it boring, then you may have to redraft yet again, so never feel an obligation to impress the people around you by announcing the finalisation of your baby.
4. The most important one: Be objective.
This applies to both giving and receiving advice. Evaluate each point they’ve given you objectively (ie. Actually, I can see how this could be misunderstood - maybe I should try changing bla bla bla…etc.) Give everyone’s advice equal consideration before implementing or discarding it and this way - you’ll get a large range of responses to compare amongst. Value honesty and try to sway away from those who don’t read a lot and so may be more likely to shower you with praise and rainbows, as these people are more likely to be wanting to please you. Never forget, ultimately - that the work is yours. Even the best critic can be wrong (Stephen King’s english teachers told him he couldn’t write) so despite objectively taking on the suggestions of others - never give others’ opinions more weight than your own.