Practice Saying No and Offer an Alternative When Necessary
Most people I know spend their Christmas season busy doing things they didn't want to do in the first place. Start today by saying no to commitments you know will cause you stress over the holidays.
If saying no is hard, then offer an alternative. I won't be able to , but it would work if I could instead.
With an early start, you can survive the hectic holiday rush. I'm sure that in December you won't regret any of the time you've spent while the pace of life is comparatively slower.