Hello, I have lived in SE Cornwall since 1990, and I grew up in west Cornwall from 1962, so with the time I went to uni and then to work in London and overseas, I have lived here for more than half my life.
My 2p worth is bring your work with you. (I did.) Unless you actively seek a career at minimum wage, you need to have skills and knowledge to market yourself outside the local area.
Be friendly, get a dog, say hello and live in your local community. Do not erect the highest fence you can around your pretty cottage so walkers cannot enjoy the view.
Our beautiful village has suddenly been discovered this last year, and there is suddenly more resentment to incomers who can buy uninhabitable cottages for silly money at auction, to do up, redecorate and put on AirBNB. Because one of DH's team wanted to buy it, fix it and it sold for twice his budget.
But actually, if you come here to live, talk to us and muck in, and aren't a sanctimonious preacher telling us how politically etc misguided we are or how culturally deficient or racist, then we're quite inclusive. We are chilled with sexual politics, artists, athletes, scientists and expatriates. This isn't Falmouth, where DC is at university, which is chic, scenic and hipster.
However, there is a lot of Cornwall where you will encounter resentment, and given that "down the spine" of the county, the villages aren't pretty coastal idylls, but closer to ex-mining cities with similar politics, you'd be well advised to use your ears and mouth in the ratio nature provides them.