Do not allow yourself to feel deprived! Whilst you are denying yourself alcohol, be prepared to permit yourself a high level of self-indulgence in the alternatives you select.
Avoid situation where you have everything but the drink, and feel it to be the missing item required for a sense of completion!
Aversion Therapy: Write a cheque for £100 or so to the cause you hate the most. Give it to someone you trust, with instruction to mail it, should you lapse.
Next year, why not do it the other way round: promise yourself some real treats as part of your Christmas inebriation as a reward for abstaining in the month leading up to them.
Just a thought....
Whilst the 'Detox Month' is of benefit to liver, capping overall consumption may be of greater benefit wrt cardiac health!
Good luck with your endeavours!