I am starting to become more and more experienced when it comes to trans women. I’m not saying I’m an expert (yet) but I am getting there 
Trans women can have it a lot easier than trans men, but that all depends on the amount of testosterone she has (luckily I don’t have a lot myself).
During childhood puberty inhibitors make it very easy for a trans woman. The estrogen will immediately kick in and feminize the body, but also keeps the voice pitch higher than that of a male around the same age.
For older trans women the social transition might get harder though. While you can easily buy fake breasts and tuck your penis, the male skeleton might already have grown, not allowing to get a feminine body. You should think about the rib cage, hands and feet. These are parts of the body which are almost impossible to alter by surgery (or corsetry for the rib cage).
Facial hair might be a problem. Daily shaving and for some perhaps more than once a day. Just imagine stub showing through your foundation!Â
Baldness and a withdrawn hairline is a very common problem. But you can get good and not overly expensive wigs to counter that problem.