Welcome from Brittany. I have lived here for 8 years and am finally coming to terms with the bureaucracy. I love it here, but I would strongly suggest at least 1 year of renting here to see if you can survive. Sadly most don't. Google for Angloinfo Bretagne and read the general, houses for sale, etc.
Also, my experience of several friends downsizing, has shown that many houses are priced for an English market, both French and English sellers. Really shop around.
Not wanting to deter you, but if you know what to expect it will be much easier.