I've lost 91 lb or so over the past year.
It's not easy, I've completely re-educated myself in terms of the way I eat, and I exercise. A LOT. Hard stuff too, like running and lifting and getting absolutely drenched in sweat.
I started at a similar weight to you and it was daunting thinking about how long it would take. But the hardest bit is starting. After that it gets easier and easier as the habits get more ingrained. After about 30lb I really didn't think I could do the same twice more, but over time you just keep doing it because it's a habit, and time passes. You're not perfect every day (or any day

) but your tastes and interests change over time, and what you're doing just becomes normal, every day stuff.
Eating wise I don't follow any specific plan, I just try to eat a range of fruit and vegetables and make healthier choices. Before I started this I ate rubbish because it was all I knew. Now I know that I like spinach and squash and rocket and other healthy stuff it's no harder to cook those than it was to cook the rubbish I used to eat.