If I could give one tip for people - it's not an exercise or nutrition regimen. It's to walk your talk and believe in yourself, because at the end of the day, the dumbbell and diet don't get you in shape. It's your accountability to your word.
You need to put what you learn into practice and do it over and over again until it's a habit. I always say, 'Seeing is not believing. Doing is believing.' There is a lot to learn about fitness, nutrition and emotions, but once you do, you can master them instead of them mastering you.