Above all, make sure that you’re paying attention to what your body is telling you. Be on the lookout in case sort-of-sore turns into bad-sore. As someone who has gone through horrific bouts of gender dysphoria, I can say with absolute empathy that I know how it feels to be desperate to change your body. But needlessly hurting yourself isn’t going to make dysphoria better.
Some things to watch out for: Any kind of bruising, redness, or swelling, especially under your arms; trouble breathing or chest tightness; soreness that last more than a couple of binder-free days; and dehydration if your binder makes you sweat.
The most important thing throughout the process is to take care of yourself, especially when others aren’t looking out for you.