Anyone have HRT or DIY HRT guidance for someone living in Japan?

Being in Japan has allowed a couple of people to find me, and both are asking how to get started. Best I've got is "speak to your GP or go DIY via the US supply chain and hope to get it past customs"... Neither is a great response.

Please boost for exposure, and if there are Japanese HRT resources for trans women please share. Both are English speaking people living in Japan, I mostly want to help them with finding information.