The first thing to do is identify your motivation... that's right, is it because you want to feel better, look better or challenge yourself? It could be something totally different however you MUST identify what it is that makes you hungry for results?
Are you losing weight to prevent a serious health problem, such as diabetes or heart disease? Are you determined to look and feel great by next summer? Whatever your reason, you need to believe strongly in this and use it to keep your motivation firing. Remember that you need to do this for yourself - if you're losing weight to make someone else happy, it's going to be a very difficult journey.
Believe in yourself and remember the most important thing, You can do this if you only TRY!