I think I’m more concerned with your “need to get things right, aka perfect”.
What I understand is that for you holidays are when you do your overeating, and for this holiday period you’d like to do some, but less than you’ve done previously. Maybe a lot less. I hope I’ve got that bit right.
If so, what I suggest is that as you go through these holidays and you encounter stronger and more frequent feelings and thoughts of desire (coming from your expectations of overeating due to it being a holiday) if you can identify non-weight reasons to eat less, you may well do better with this goal.