Napping.Synth.Downloadobligatory "transmasc DIY is also a thing" post!
https://diyhrt.info has some resources, but getting a hold of testosterone and finding the resources for proper dosage is a lot harder than it is for finding estradiol and resources
There are luckily some resources on diyhrt.info, but I've not found much outside of that (apart from some non-HRT related tips like resources about packers or binders)
point is, DIY is for all!