http://www.bakadesuyo.com/2012/12/last-damn-thing-new-years-resolutions/
^ a collection of wisdom from multiple experts. In brief...
pick one resolution.
break the goal into steps, have a plan.
reward yourself for progress.
realize you may screw up -- keep at it.
keep it tiny.
surround yourself with supportive friends.
it takes an average of 66 days to establish a new good habit.
to stop bad habits, replace them with another habit, and avoiding triggers.
WRITE IT DOWN.
and most of all [guilty!] "knowing" is useless without DOING (http://www.bakadesuyo.com/2012/12/read-1000-chang/) (i.e. it's not enough to direct the "rational mind", you also have to motivate the "emotional mind").
PS: might be a good idea to not make your resolution(s) while your brain is still high on GABA on low on GLUTAMATE (http://www.youtube.com/watch?v=vkpz7xFTWJo) (i.e. "thinking clearly about almost nothing"). (FASCINATING youtube channel: http://www.youtube.com/user/AsapSCIENCE/videos )
This is good for goal setting in general anyway, smaller focused goals are easier to achieve than larger nebulous ones.
7 Most Sought After Good Habits (and How to Achieve Them)
http://lifehacker.com/5974857/the-7-most-sought-after-good-habits-and-how-to-achieve-them