I've got 4 stone to lose and understand its going to take a long time to do it but it's taking even longer because I can never actually get started. (I'm also a stone heavier than when I "started")
I've sat down and planned out 5 daily rules and rather than focusing on what the scales say I'm going to focus on making sure I tick them off daily (or realistically at least 3) and the scales should take care of themselves. (Calorie goal/exercise bike/more water/10k steps/50 squats or sit ups)
You can follow whatever works for you, my theory is its the regular posting and accountability is what will make it stick...I hope!