You need to eat even less to lose weight after starting hrt, but I believe that whether it is harder or more difficult is a personal matter that only you can answer.
I can't lose weight when depressed, and put it on instead. With hrt I'm not depressed - I'm feeling very motivated and losing weight at a rapid rate. I must admit I'm cheating a bit with some drugs, but that only makes it easier. I was losing weight before that, only suffering more in doing it. I really like food.