first, pay attention
Before setting goals and changing habits, simply start paying attention.
One of the most common places where this doesn’t happen enough is with weight. A person decides they want to lose weight so they jump on a scale (which they may not have done in months), decide that they want to be 15 lbs lighter (or some arbitrary number)... they stop eating breakfast, stop drinking water, stop buttering their toast, stop dressing their salads, they count every almond, avoid avocado, stop eating after 6pm, everything low fat….
Wait! Hold up, actually. If you want to make any change anywhere you have to understand and respect the thing you’re trying to change, period. This means study it, pay attention, take note.
Pay attention without attempting to change anything. And make paying attention an active goal: Be specific, measurable, attractive, realistic, and time-framed. [i.e.: you’re going to weigh yourself butt naked first thing in the morning and then again at night in the northeast corner of your bedroom (specific). You’re going to write it down in your Notes app on your phone or your beautiful moleskin notebook (measurable). This is attractive to you because you know it’s going to provide you valuable data (attractive). This is realistic because there’s no reason you can’t take 30 seconds to do this before your morning coffee and after your evening Netflix (realistic). You’re going to do this for the next week and then evaluate for the next step (time-framed).]
Until you observe, you don’t know how your weight behaves on a monthly and even daily basis. You may be lighter in the morning than in the evening. You might be lighter when you’re dehydrated, or heavier because of water retention. You may weigh more after cardio but feel less bloated and generally better… Pay attention, because learning these specific details enables you to clarify more precise goals and understand how you’re body will be affected by the variables you subject it to.
This goes for anything. To change your eating habits, keep a food diary. To be more productive, pay attention to what you do in a day. To save money, notice how you're spending. To feel more energetic, pay attention to your energy levels and what might be affecting them. Not only relevant to personal development, paying attention is the difference between cruel politics and progressive ones, estranging society and productive community, alienating conversations and creative ones. Understand and respect before change.