Hi Gary,
I moved here almost 2 years ago, after years of planning, and have no intention of moving back. It has been everything and more that I hoped it would be.
I knew the area I'm living in now as friends owned I house here and I visited frequently. It was my first introduction to France really.
I bought a bran and a complete ruin 10 years ago, renovated the barn first as a holiday home and completed the 'ruin' last year and now run that as a gite - very successfully through AirBnB. I had a three year plan to see how the gite went, with a back-up plan to sell my place in London if it didn't work out. Happy to say that I get a reasonable income from both, am in the French tax system, got my medical card (I didn't opt for top up, depends on your personal circumstances I guess).
First thing I did was get a rescue dog in week 2, that was a big part of my wanting to move here. The walks are amazing, beaches close by (I'm in dept 35 in between Fougeres and Mont Saint Michel), and walking the dog 3 times a day plus getting the gite set up takes me through to tea time. Faffing around in the garden and stacking logs for the winter just about fills in the rest of the week, and I love it.
Be brave, but not too reckless. Yes rent at first to make sure you like the area and pace of life. Rural life is very gentle, but there are always groups you can join, and people are very patient when your French is just finding its feet out of the classroom.
I haven't had any issues with registering for anything, other than my initial ignorance, so then I paid someone to walk me through things and that was money well spent.
It helps that Rennes is only 45 minutes away and a decent city, and Paris is 2 hours by TVG. That said I rarely feel the need for city life now after 27 years in London.
Check on line, there is loads of good relaible info out there, also have a read of 'France, on the move' by the Chambre de Commerce Francaise de Grand Bretagne, I think I got it off Amazon? It's a really useful starting guide.
I hope it goes to plan for you, let us know how you get on, or if you get stuck give me a shout, I'm sure I'll know someone who can help if I cant.
Paul