Its not hard to do because it just isn't, If you want to do it you will, if you don't, you won't. It's just learning how to keep a workout schedule, and learning to eat correctly which shouldn't be hard since the whole rest of the world seems to do it. The internet helps tremendously also, food recipes, tips for working out, there is a whole world for you to explore and learn how to lose weight.
I weighed 330lbs, ran everyday for 2 and a half years, changed my diet by not eating fast food, laid off of sugary food. It wasn't hard because I wanted to do it, its a mindset. Thats all I can really explain it is hard for people because they are not in the right psychological mind state. They still care what others think, or how others will perceive them. My friends made fun of me, but now 2 years later they are still overweight, and I am healthy and loving it.
Btw I still workout everyday and still eat somewhat healthy, I will admit I have ate fast food recently, but still cut down the portion size. Throw out the fries and replace the drink with a diet coke.