I think it's really about going at your own pace and being patient with yourself! I'm still trying to find my happy middle as well.
For hair, find a local non-chain salon, and let them take care of you. They'll work with you, recommend the right products for your hair type and the style you'd like to go for. I gave up trying to style mine and instead just super take care of it. I personally wash it once or twice a week with a fairly expensive Japanese shampoo/conditioner that my stylist recommended (I've been seeing her for over 11 years and we're great friends... She's been such a huge help through my transition). I also started to decorate it with cute bows and hair bands- I really recommend this! I've even started making my own!
Makeup is another story - I've been struggling, but honestly really care more about having healthy skin. Definitely start building a skincare routine so your skin starts to naturally glow. I also recommend a BB cream if foundation doesn't feel right for you (not a fan of foundation tbh). From there you can find a tinted chapstick if you want some color for your lips. As much as I'd love to give you pointers on eye makeup - this is my biggest struggle area right now, but we're just getting started so practice and patience!
It can be really disheartening seeing other women just radiate beauty, but remember that they've had many many years of practice and definitely struggled when they first started π©·
Ya... honestly I wouldn't put much stock in Internet insults- easier said than done, I know. I think it's really easy to get lost in our screens and forget the real world is incredibly different. It's really frustrating how our brains sort through things- you'll get a lot of positive feedback, and then one or two negative comments and that's what our brains decide to focus on. I think it's fairly normal for a lot of people, but I think it's worth working on training your brain to untangle those types of thoughts. I recommend looking into Cognitive Distortions!