[Jason.]

You can still start now even if Christmas is just around the corner. Just have Christmas Day off as a cheat day where you can eat whatever and then go back to eating healthy/working out afterwards. Christmas is in 3 weeks so there's still quite a bit of time.

Or start now as a sort of trial run and give yourself a week to see if you can stick to it and if you can't, come up with a more realistic goal and then start again in the New Year when you're ready.