i have found that if i let a few close friends know that i am working on myself, i am more motivated and positive with the situation and more apt to stay on track. When i didn't tell anyone, and attempted to do it myself, friends didn't know and offering me a large piece of cake or donut was nothing. Now that those close friend know that i'm working on myself, they don't offer me the big piece of cake but offer encouragement instead. Keep those close friends closer during this time.
Friend's support is a great way to lose weight. They are great motivators and positive influences in your journey.