I wouldn't worry about it too much Stacy.
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A lot of it will depend on your age. People in their early 20's won't have a lot of time before things become noticeable. Unless we're really fortunate with HRT results, middle-age transitioners like us tend to have more time before people notice.
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I'm 37. I've been on HRT for 13 months now. I'm almost done with electrolysys, so there's no beard shadow to speak of even if I don't shave for a week. I have long shoulder-length red hair. If my brows were any thinner, I wouldn't have any left. I keep my nails long and trim (no polish though). Outside of work and family, I'm full time, and people accept me as a woman.
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At work, and with my family, everyone sees me as a man. I wear a baggy shirt to hide what little chest development I have, and don't wear any jewelry, but otherwise I look pretty much the same (aside from subtle clothing/makeup/voice/mannerism cues). And you know what I've learned?...
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...people are dense. Reeeaaaaally really dense. As long as you make the changes slowly and don't draw attention to yourself, it's unlikely anyone will notice. And even if they do notice something, it's extremely unlikely that they'll think of HRT unless they have previous experience with Trans issues.
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I'm not exactly sure what your friend was so shocked about (the "Rocker" hair maybe? It looks like it's getting to that awkward middle stage where it may be getting hard to manage. I always just went along with the 'rocker' 'hippie' and 'headbanger' jokes of my co-workers. If you keep it light, and it doesn't seem like a big deal to you, it won't seem as big a deal to others. They may think you're going through a mid-life crisis, or trying to relive your rocker/hippie youth...and then finally and eventually just accept it as you, but you can use their assumptions to help deflect/diffuse the subject.).
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I think you look enough like the original photo to be just fine for a while. People will probably notice the hair growing out the most, because there really isn't any way to do that subtly. Because of that, I'd probably be careful about any other noticeable changes (ie. thin eyebrows, ear piercings, etc) I've had long hair for over a decade now, so that hasn't really been an issue for me. (though I still get the rocker/hippie/headbanger/skater jokes

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But anyway...breathe easy. You should be fine for a bit.
We all work at our own pace, and you'll get there when you're ready for it.
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Best of luck,
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Kay