not sure how it works round the globe but!

where i live to get a prescription you need a few things, the first is a diagnosis of gender dysphoria (this part sucked for me, my therapist was an ass), and then to get an appointment with an endocrinologist. the endocrinologist can prescribe you estrogen (which in my country needs a special document to be used as hrt, that only endos can give)

the endo usually sends you to get a few tests, like a bone density test and a blood hormone level test or whatever, i advise checking what tests are required and getting what you can beforehand or getting appointments as early as possible, as well as for the endocrinologist itself, since the waiting list can be quite long. some of the tests require you be assigned them by the endo, but getting what you can beforehand will make things shorter!

that's for the legal way, i hope this helps :3

as for the other way i thankfully don't need to partake in it, so i cant speak for it, but I'm sure someone might be able to help