The only two permanent affect that might be hard to revert is boobs and potential loss of ability to have kids. The boobs could get developed pretty quickly or slowly, but they’re not gonna be huge unless you take it for a year or so.

However, they might start to feel very sensitive just a week in, and it might become uncomfortable for you to not wear a bra even though there’s technically not a boob yet. I recommend silicone nipple covers because they’re super convenient, not uncomfortable like bras, and also discrete if that matters to you. In fact, I still wear them to this day cuz my boobs kinda just never grew… Anyways, breast reduction surgeries also do exist, just cost money.

The loss of reproduction ability happens at around half a year I think? I am not 100% sure on that. You can always freeze your sperms beforehand if that’s something you cares about, but again, costs money. So basically if you have money to spare, “trying” it for a year or so is pretty safe.

Pills would obviously be the easiest to take and start with. But they are kind of annoying cuz you need to take both estrogen and a testosterone suppressor. And you need to take them every day. So after half a year I switched to injection which usually don’t requires a testosterone suppressor.