My starting weight was the same as your current weight, and my goal is similar to yours. I'm 5'6 1/2", medium boned, and 28 years old. Maybe that gives you enough information to see whether we're similar.
I lose 1-1.5 lbs. per week if I consistently stay under 1500 calories. But I had a hard time doing that -- found that I would eat too much junk food and go over calories at least three days per week. Right now I am not counting calories, just limiting my amount of junk food, but I estimate that I'm eating 1900-2100 per day. Now I'm losing maybe .5-1 lb. per week.
I agree with the advice that you should start out higher. It will take you a fair amount of time to lose 54 lbs., and it would be difficult to stay at around 1200 calories for all that time.
Good luck!


