As others say,
Hair removal, if you plan to, must be started as soon as possible. This may takes several years to get the results you want
Voice training, it can be a short or long journey depending on your starting voice but it's never too early to begin.
Try different clothes, learn what fits you right and whats not and remember : skirts and dresses don't fit anyone including cis girls. You will learn which color and type of clothes to hide what you wanna hide and emphasis your great points.
If you wanna lose weight, it's a good idea to start now but keep it slow as you don't wanna create body imbalances before stating hrt. Better than losing weight itself you may try to change your lifestyle slowly like eating habits, adding sports or any physical activities to your routine and an activity that help you change your mind.
Any kind of physical activities will help you stay away from depressive feeling and let you enjoy your transition better cause at start it's peak and valley.
You can also analyse your family/friends/coworkers this way youll have an easier integration afterward cause you'll know how to prepare them and how to reduce the shock it may cause to some of them. It's good to know better peoples around us anyway

Oooh and try to learn the limit between feminin and too much. It's up to you if you wanna be too much, but many trans seem not to realize how extreme they are. If you go this way, at least know it

Now, keep it up. You're only a few months away from what you want.