Here's a couple of tips that help me.
1. Map your progress, Take before pictures, weigh yourself measure your self right everything down and see how your body changes.
2. Have a room where you workout, I've converted a room in my house into a gym with some basic equipment like some dumbells, bench and rowing machine, mirrors. When I go in there I automatically switch to workout mode and there's nothing to distract me. Plus you can make alot of equipment yourself for cheap. Like a pull up bar, dip bars, pushup handles etc...
3.Make a plan AND WRITE IT DOWN. Decide what excersises you are going to do on what days and when you are going to rest and what you're going to eat and when and stick to it. Often If i go to the gym and I havent planned what i'm going to do there then I end up doing nothing.
4. Find a healthy diet that doesn't deprive you of anything. You can eat fats if they're the right fats Like olive oil and nuts, you can eat carbs if they are the right carbs, low GI, wholegrain. You can definately eat proteins, lean proteins. I recommend the mens health abs diet, see if you can find it in the library and read it.
5. Make one day a week where you can eat anything, but only ONE. That way you wont go crazy craving chocolate, ice cream and pizza.
6. Get some friends together who also want to lose weight and compete with each other, who can run the furthest who can do the most reps, who can lift the most weight etc.. then try and beat each other, makes working out fun, and you're always pushing each other. But make sure that you don't end up getting together and just talking about losing weight and not actually doing anything, which can easily happen.
7. Set goals, Some one once said that if you're not aiming for anything you'll hit it every time! meaning that if you dont set a goal, you'll be satisfied with whatever you achieve, even if you achieve nothing.
8. Read books, watch videos. Go on youtube and check out all the videos of people who have transformed there bodies, plus check out all the workouts there are on the net, theres a lot of motivational stuff out there, You tube is a goldmine!. Read books about the benefits of healthy eating and you'll soon want to ditch the fries and grab the fruit.
9. Find reasons outside of yourself. you wanna look good for your girlfriend or boyfriend/ wife or husband. You wanna win the race. you wanna be able to run around the yard with your kids one day without going into cardiac arrest. That way when you dont feel like eating right or working out you can say to yourself. "I dont feel like doing this, but I do want to be able to take my shirt off at the beach" Or I dont feel like doing this, but I do want to be ready for that race in 3 months time" or what ever you want. I find keeping the reason focused on other people or things helps, that way, what I feel is irrelevant because I'm not doing it for myself i'm doing it for some bigger cause.
Oh well that's pretty much all I got for you. Hope it helps.