That time again..to try to lose weight

Losing weight will haunt me forever. Me and two other girls have entered into this contest sort of thing between us to lose weight. It is like the biggest loser on tv. Each week we get weighed together and the person with the most weight loss for the week doesn't have to pay into the pot but the second highest loser pays half the weight loss in dollar amount to the pot and the with the least weight loss for the week pay the total amount in dollars to the pot of what the biggest loser for the week lost. for example:

Kelly loses 5lbs for the week - pays nothing in the pot
Sarah loses 2lbs for the week - sarah pays $2.50 (half of kellys total)
and Kim loses 1lb - Kim pays $5.00 to the pot (the full amount kelly lost)

At the end of march whoever lost the most amount in weight total gets the pot. It keeps us all on track and competitive.
Tomorrow I am joining the gym and have a personal trainer scheduled for 8am to help me achieve my goals. Going to start aerobic kickboxing on monday or wednesday nights as well. Plus of course have been and will continue to eat healthly.
So I am hoping this time I will lose the weight and keep it off. It is all about a lifestyle and routine. So get into a postive one and all should work. Crossing my fingers and trying really hard this time.