The biggest milestone for me was setting my goal too high. No criticism intended, but I see a lot of people who are starting off at more than 250lbs who want to get down to 120 or 130 as their goal. For me, my goal (of 175) is so far away (205lbs from start), that I don't bother to keep that goal in my profile. If I look at such a daunting number, I will stagger quickly. My goals are always realistic. I can say "hey, 25lbs isn't much", and when I reach that goal, move it back some more. It's nice to see visible progress.
I also know that I cannot have certain foods in the house. If I have LC ice cream bars, or SF Jello, a can of whipped cream, or SF LC chocolate, I will sit there and eat them until they're gone. I can eat a whole 2lb can of nuts in a day without noticing. I do not have self control, which is why I started at 380lbs. I'm aware of this, and getting to the point that I could acknowledge it is when I started to lose weight.
This is not a diet to me. I will not ever be one of those people who can get to goal and then slowly carb back up and be OK. I like to eat. I like food. I like a lot of food. I can graze all day, and then eat a huge 4 course meal. If I want to ever get anywhere near a normal weight, it is going to be with the help of LC. This way of eating has taken away my desire to constantly shovel food into my mouth at all hours of the day.
I cannot plan cheat days. If I do, my cheat day will turn into a cheat marathon week, and I will gain back in 5 or 6 days what I lost in a month. Pizza Friday night ends up with left-overs Saturday morning, which turns into Chinese for dinner Saturday night, and waffles and syrup with chocolate milk on Sunday, ice cream for lunch, and then McDonald's to top it all off Sunday night. Cheats do me no good!
Most importantly, I am able to look at the scale and not nearly cry. I can say to my mother and my fiance, "I'm down to 324lbs" and not cringe. I have accepted that I have a weight problem, that everyone else who can see me is aware of it, and that now that I have confronted it I can work on it.