Funny new avatar (talk about a fat cat!)
Weight loss usually progresses smoothly until you hit natural set point plateaus at ~15/15% and 10-12%, as body mass metabolic rates shift to compensate for "starvation", then it crawls off..and usually not very well in the winter..summmer maybe.. Of course, you have gained and lost fat before, like most of us. I presume you'll use 'chemical aides' to facilitate loss rate.
Good luck.