Hello,
Yes I am the same - I have previously lost 35lbs and it took about 1 year. Then I had some problems and re-gained.
Kibstix is right - everyone is different and you cannot predict. Most people lost a lot at first, then it slows right down and stalls, gains are common before getting there.
If you follow the plan to the letter and don't cheat (unlike me) it will be smoother and faster
Good luck.