A bit late to the party!
As someone who moved here many years ago, just don't. The only people who seem to manage here are retired people, with no mortgage, decent savings and no ties. Maybe that's you.
If you have responsibilities or family across (the "mainland") then the costs of travel are crippling. No Lidl or Aldi, food is expensive. Renting is shocking and difficult if you have pets and children.
People don't realise how much this is not part of the UK. Finance - ironically, can be hard work, only 2 credit cards available to residents (you can't keep your existing UK ones). Mortgages are expensive and there isn't choice or flexibility.
Primary schools are good, no SATs, high schools less so. Different funding for university if you have teens and you lose the option for student UK loans if you live here more than 3yrs.
The island is beautiful, there's no doubting that. The weather is appalling. Winters are long, windy, damp and misty, very few crisp winters days. Summer is short and often not great.
Healthcare is hit and miss. We have a nice modern, clean hospital, but waiting lists for some things are huge. GPs can be difficult to access. Other things need to be treated across, flights are covered, but everything else isn't, having to fly/ sail when you are already ill or recovering from surgery is no picnic - take it from one who knows! If you are thinking of retiring here, then thats something to think about. Health insurance is technically required to travel even to the UK, we have reciprocal agreements with them for emergency treatment, but nothing extra. No European health agreements. We aren't part of the UK NHS.