A good method you should have a look found on the Harvard Business review. This is what they call the "if then planning". That means that it also take into consideration the high possibility that you may fell at some point in your path to achieve the goal.
But what I also like about the tool, it is it forces you to think through your goal in order to have concrete steps to follow in order to achieve it.
Moreover, you may print out your goal sheet, which is great as it will force you to constantly watch it, and it will then empower you to stick with your plan.
You shall try it out! Especially during those times of good resolutions.