I'm 5'6 and 180 lbs and I carry ALL of my weight in my hips, ass, and thighs. It gets frustrating when buying clothes, but it can be manageable. The biggest thing I've done is lift heavy for my upper body. The bigger my shoulders and chest are, the less noticeable my curves are. Also, you simply just have to lose weight. When the T starts working it's magic, a lot fo that weight will end up going to your gut anyways, which nobody wants. Cardio and lowering your carb intake will eventually start to burn fat from those hard to lose areas. Don't start doing squats or anything because you'll build up those muscles and it'll just make you look bulkier in your lower body. Stick with biking, or something that targets your legs to lean out. I also tend to wear my pants a little lower and wear longer t-shirts.
Don't worry about having an ass so much though, girls actually seem to like the fact that I do, even though I'm pretty dysphoric about it.