For the record... I lost 60 pounds is just about a years time.
I weighed more than 320 pounds. And in about a year's time I was down to the 270 range. The lowest I've been was mid 250s, and now I'm probably back in the 270 range again. And I haven't lost a bit of muscle mass. My thighs are probably as big around as your waist, and my calves, as big as your thighs.
It's not hard to lose more than a pound a week, when you aren't focusing strictly on calorie content weight loss.
Everyone's body is different, certain things work for certain people. The best bet is to try a few things, see what you can stick with long enough to lose weight, and go with it. For me it was the Atkins diet. When I was younger I tried all kinds of things, personal trainers, Nutrisystem, Weight Watchers, Jenny Craig, etc. But none of them worked for me. Then a few years ago I tried the Atkins diet, and it was a perfect fit for me and my lifestyle.
Do what works for you