Welcome to Susan's Place. We often use the expression "Your Mileage May Vary" as a way to indicate that you, as an individual, may have very different results form the next person.
If what you want are breasts then you might consider breast augmentation surgery and skip HRT. HRT may eventually cause sterility and you won't know for sure unless you have a series of sperm counts. This is a good place to find information, opinions, resources and shared experiences.