I'd be hesitant to start estrogen and the supplements without a Doctor's look over, it's better to err on safety (and compared to the hormones themselves, its really not THAT expensive, only a couple hundred dollars (if out of pocket), it's not so bad considering how long you'll be on them). Definitely do it soon but only when youre ready ^_^ They'll do all that irreversible female puberty stuff, so you NEED to be sure. Just flashback to sex ed, female puberty, that's what you'll be getting (minus the period, obviously).
T-blockers are a little different, they will only minimize/eliminate the "damage" testosterone does to your body, and once you go off them your body will go right back to producing hormones if you change your mind, so the "risk" is less so start those if you can. Testosterone is the big culprit because it causes masculine "damage" to your body as you age. Things like facial and bone structure changes (like pronounced brow, the "neanderthal" effect that men have, or pronounced, kevin-sorbo-chin syndrome XD) and, perhaps most importantly, hair loss (if your hairline is indicating anything about loss, mine was already receding in high school, so you might check.) Stopping these things is MUCH more important to passing than having breasts is.
If you make the blockers your priority, you can start the estrogen at your leisure and get near-optimal results, be it in a year or 15 years from now. At 17 you're set to be indistinguishable from a cis-girl if you get on the blockers soon ^_^
As for feminine without the hormones, there are vitamins that will help, like Vitamin A is very good for skin regeneration (and helps with acne to keep you smooth!). And, stick to bladed razors if you're shaving, the scraping promotes collagen production (get what you can out of it while you're stuck with it!).
If you want to focus on pics, learn some things about photography (like, upward facing angles make you look more feminine, by making your eyes seem bigger and chin smaller). When you put on make up (and unless your beard is blonde, you WILL need it, at least a little) avoid dark lipstick, use pinks and MAYBE peach tones, purples and blues and blacks will make you more manly. I don't know WHY but they just DO XD Also, depending on your hair, you might consider investing in a wig, there are some VERY good ones for cheap online (I use wowwigs myself), something cheap if dressing up is going to be scarce for you (as you are still living at home i take it in a non-supportive environment) a 30 dollar one might be a good investment. If you want a more "full time" one those run about 2-300 dollars, with the REAL fancy human hair ones up at around 1,000 (or more). Again, this all depends what your hair looks like =P Mine has been thinning for a while, and personally once the pressure was OFF to try and cope with it, to keep checking it in the mirror, I felt a lot better, like I could concentrate more on other things, and having fun XD At least until I can get it restored.
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