Yes, it is enormous, alright. And T-blockers and estrogen don't make it any less so. There's a LOT more to it. And if you're speaking of me, in reference to "presenting as female", then I'm highly flattered! I'm still at the very beginning of my journey. I've been dressed now exactly 3 times in the presence of others: once for a girls' night with two friends in transition, once for my therapy session this week, and later that same day at my support group meeting. Passing? Not even close. Working on a bit of everything at once - clothing, hair, makeup, voice... the list goes on. There is a LOT to learn. I'm just barely scratching the surface.
Clothing: I get my stuff so far at the local thrift shops. There's some nice stuff there, and very cheap. So far I've got a pair of jeans, two tops, a watch, a necklace, a purse, a pair of shoes. Total investment, maybe $40. I've discovered I can go into these shops in full male, and browse the women's clothing, and nobody bothers me. It's easier if you have a friend to go with, who either IS female, or presents as such, but I've discovered that nobody (so far) has called me out. The first time was really scary, but it gets easier. And you can try stuff on, and nobody bats an eyelash.
Everywhere you look, there is something else to learn. On my way to my girls' night, I realized I wanted some lipstick to wear, and had to stop off at a local drugstore, which had very little in the way of selection. I ended up spending $20 on one lipstick. Grrrr! I'll try to be a lot smarter in the future.
I'm lucky, I've met a few really good and helpful trans friends locally, and there is a good support group nearby also. Try to connect with local trans people for help - they can be a really good resource. At least I've found so.
I'm also finding I can practice my voice in my normal life, both at home and at work, and so far nobody has noticed a thing. I'm pitching my voice just a little higher than normal, and placing the resonance above the voicebox in the throat, and in the head, rather than in the chest, and doing this in normal conversation, pretty much everywhere. It's kinda freaky that nobody's said anything yet, not my wife or children or anyone, but I sound rather different lately. It's cool.
So there's LOTS you can do, and lots to work on. But when eating an elephant, it must be done one small bite at a time. And before you know it, you look back and see how much you've eaten.
Hope this helps. Hugs to you...