Whenever I have successfully lost weight, I have been obsessive about weighing. I often weigh twice a day. I'm very realistic about it, and use it as a tool -- if I am up a little, I think about what I did and how I could do differently. If I am down, I celebrate.
In order to lose weight, I have to actively think about it all the time, or I end up gainning weight.
Daily Weighing Helps People Lose Weight, Prevents Gain