controversial I know, but I weigh myself every morning at the same time - the reason - in the past when i've done a weekly weigh-in I've been devastated if i've stuck rigidly to a plan and either not lost ,or worse, gained a 1Lb, this way I can daily monitor and track my progress.
Also, whilst i've got an overall weight goal, my issue is sticking to a plan over a period of time. Its logical that if i stick to a plan I'll lose weight, but the challenge is sticking to it for a decent length of time.
My goal is to do 3 months with the first goal of 1 month; I then break that into mini-goals of half months - i've cracked 60% of first goal already!!!