I can only give you feedback regarding my own personal journey.
1. Deciding to undertake the weight loss battle--well aware of the fact that I was overweight for years, feeling young and invincible at first (whenever I get around to doing it, I'm young enough it'll fall right off), awareness of all the ways the quality of my life was suffering--couldn't play outside with the kids for very long, haven't worn shorts in years, feeling unattractive to my husband, feeling embarrassed everywhere I went, still gaining weight. I think the straw that broke the camel's back came for me this past October when I went to the doctor weighing an astonishing 270 lbs! He scolded me and told me I was fat. I, obviously, knew that. I took a home cholesterol test where the results were off the charts, and I was dealing with issues related to high blood pressure and asthma. I think I finally just really got sick of it.
2. I then decided to undertake weight loss seriously, with the idea in mind that significant progress could be made by next summer. I began to study all things weight loss--fitness, calorie, BMI, BMR, calories in vs. out, etc. I joined a gym--that was a financial commitment that helped me to take the whole process seriourly. My overall humiliation over my appearance and sadness over feeling like crap all the time and mourning over the life I've lost from being a tubbo was the gas in my engine, I guess.
3. Sticking to the program--there are two sides and two very different emotions that go with this. When the program is working and the weight is coming off, the energy of "discovery" and accomplishment carries me forward and keeps me on track. The momentum from success is very helpful. When a plateau happens, the energy to stay on track comes from the emotions that got me started--disgust, sadness, and mourning, and more and more--determination. I'm not going to come this far to not finish.
Today I weighed in at 228 (34, F)--still have a LONG way to go but each day, am making progress. It is nothing short of WAR, like PrISM said above.