You want your behavior-based goal to be attainable, i.e. not so overwhelming that you start out feeling as if you can’t do it. That defeats the entire purpose of the exercise. Start off with smaller goals that you know you can achieve, such as positively changing one single habit, and focus on doing that consistently before attempting to change other habits. Build on these small successes and before you know it, you’ll be achieving your big goals, as well!