Don't make drastic changes all at once that you
hate doing. You'll get fed up at some point, and be more likely to just quit entirely.
Especially with something like exercise. As an example: If you don't like exercise DVDs, then don't do them. Dance to music, use a treadmill, take a walk, go to the gym, etc. But, don't force yourself to do an activity that you
really hate doing. And keep in mind that movement of any kind is good. I'm a walker. If walking is your thing, then walk!
That's not to say it's always easy to get up and get going, but at the very least if you pick up an activity that you enjoy or that you've always wanted to try you won't have to fight yourself every step of the way.
As for eating. Pick up a plan that makes sense for you and your life, and tweak it to fit you perfectly
Don't pick something that obviously won't fit you. Eating healthfully to start is hard enough, so if a plan you were looking at says "You must eat 10 cups of cottage cheese a day"... and if you hate cottage cheese.. then that's clearly not a plan for you so don't force it.
Whatever happens. Recognize every single healthy step you take. No matter how small.
Emotions about weight loss and healthy habits wax and wane over time. Sometimes everything's perfect. And sometimes it feels like the world is against us.
We're changing ourselves for the better forever. So when you make a mistake, don't let it ruin all the good you've done. Just kick that mistake away and get back to your healthier habits immediately.