Having smaller goals can lead to larger results.
The most significant mistake you can make when planning weight loss is to start with too large of a goal. Lofty or unrealistic goals can lead to you becoming discouraged when you fail to see significant (whatever you define as significant) improvement toward that end. Larger goals are more overwhelming than smaller ones and can degrade your confidence over time. Although large goals can discourage you because they tend to be too grandiose, I recommend a mixture of large and small goals or short and long-term goals.
These macro and micro goals can give you best of both worlds. Motivation is key to success, and it is directly tied to the belief by the individual that they are successful in their endeavor to lose weight. These small or micro goals allow you have baby steps to a more significant goal. As you meet these more modest goals, you will gain confidence, and it will help you avoid burnout. I have found that smaller short-term goals help me monitor my success and build a flow toward the final goal.
The bottom line: Smaller goals can build confidence and increase the rate of success. Larger goals with a proper timeline can help maintain that success if you can avoid being overwhelmed.