I agree, do small changes at first. Once those become habit, you can tackle more
When I first started eating healthily, I had to force myself to eat things I didn't enjoy- bell peppers, beans, large amounts of spinach. Eventually it became habit, and now if I go a day without eating veggies, I can feel the difference.
Same with exercise, I had to really force myself to go to the gym. Now, I can find enjoyment in exercising (except for running on the treadmill- that will never be nearly as fun as running on trails).
Not sure what your coffee intake is like, but it might be good to cut it out of your diet if you're an everyday drinker. Coffee should be a once in a while thing, I think
