Pushing The Button
You want to make that lifestyle change - it is time for you to push that imaginary button. Where do you start? How do you do it?
You need... a plan.
The first thing you need to do is to make a list of what habits you need to change to be healthy. Perhaps you aren't very active right now, and should be. Perhaps you don't eat as well as you can. Perhaps you should tone your muscles.
Whatever it is, write it down. Then, once you've written it all down, rank it by its importance... what's the most important thing you should be doing right now to improve your health and lower your fat percentage? Once you've determined what's most important to you, create a reasonable list of goals to meet: perhaps making sure to walk for 15 minutes a day, or to start cooking home-cooked meals, or to lower the amount of fat you eat per day.
Remember, it's very easy to get caught up trying to fix all of your faults at once. That sort of effort will drive you crazy and probably leave you sitting down and wondering why you're trying to do it all anyways? It will take a long time to make new, healthy habits, but the good news is that every little bit counts and over time even the small changes will result in significant improvements in your weight and overall health!