I went from 382 to 260 in a little over a year. The catalyst was when my wife of 20 years walked out on me and I just stopped eating, so not the best start...
I began walking, 2 miles everyday and my diet was spot on. Lots of veggies, whole grain cereal, and no junk food. I've had a steady girlfriend for the last 9 months so I'm up to 285 because we dine out once or twice a week and I drink beer those nights.
The big challenge will be to find a good balance of happiness, exercise, and diet. Best of luck to you!
http://imgur.com/L9DTQJQ