I agree with the kilojoule counting idea! I have been doing this for as long as I can remember... it has to be at least 7 years, possibly longer
I just buy regular excercise books and use one page per day. At the start I used a little calorie counter book to help estimate the kilojules, but now I don't use anything at all as I'm pretty familiar with how many kilojoules are in different foods. Sometimes I check up on the internet if I'm not sure...
I also write down the time that I eat things as well, as that's important for maintaining steady blood sugar throughout the day.
It's a great method as it keeps you honest, and prevents the feelings of deprivation that you can get if you're on a restrictive diet. Just make sure your meals are balanced and you're getting all the nutrition your body needs... I wouldn't recommend having a chocolate bar for dinner though
I think you have got to make a solid commitment to yourself, and then have the strength of character to stick with it...
"Character is the ability to follow through on a commitment, long after the emotion of making that commitment has passed" - Chris Sorensen
Sit and write out all the reasons why you want to lose weight. Write out as many as you can think of. Then read your paper every day to remind yourself. This works really well, if you read it regularly... says me, whose list is buried away in a cupboard in my kitchen (I'm digging it out again tonight to have another review!)
Oh and make your family eat the same as you for dinner. If you're the one cooking it, then you should get to decide what you're going to make! If they don't like it, tell them to make their own