Do you know when's not a good time of year to try and buy a house?
December.
It's actually, quite possibly, the worst time of year to decided to buy the single most expensive thing in your entire life.
And not being in a chain makes absolutely no difference whatsoever. Not at Christmas time. All the usual rules of buying a house go out of the frost-encased window.
Or they did for us when we bought our home ten years ago.