Well, I think that you should go as far as you want, and no farther. If you want to have top surgery, but don't want hormones, then you don't need to take hormones.
People tend to think that transition is necessarily a "complete" journey, where someone must get bottom and top surgery, and must take hormones, and meet x y and z requirements, but your transition - in reality - is just a set of measures that you want/need to take in order to feel comfortable with yourself, or your gender role, or your body, or whatever-else-have-you.
So, don't feel pressured to do more than you feel is necessary.