I have the trans endocrinology autism.
Standing offer to (in replies or DM):
* Explain how HRT works (also see the site I created https://hrt.witches.club/ )
* Explain when to get blood tests, what should be tested, and what your results mean
* Second opinion your doctors and their treatment plan
* Help you workout how and what to DIY
* Debug weird corner cases and interactions when things don't go as expected
* Refer you to others who also do this
I have more experience with feminisation HRT, but can also help with masculinisation HRT.
Boosts welcome!

One thing doctors are bad at is telling you when to get your blood tests in relationship to when you are taking your medication doses. Either they don't say anything about it or give bad advice. Some seem to think it doesn't matter at all, when it can actually have a huge effect on your test results and therefore dosing.
This following information is key if you don't want to get underdosed!
1. You should be spreading your dose out if you are taking multiple doses per day (gel, spray, or pills)
2. Your blood test should be done just before a dose, and you should delay a dose if you need to because of timing of the test.
For example if you take your HRT at 9am and 9pm every day, then you should try and get a blood test at 9am and if you cant get it until 10 or so, then delay the dose until after the test but you don't really want to stretch it out too long for a number you can do something on.
When you take any medication you have peaks and then a trough just before your next dose. The exact shape of this graph depends on the medication, metabolism speed, and dose method.
Hormones will peak within an hour or so of taking a dose and then quickly decrease back down. These peak levels don't really tell you much because they are so short, instead you mainly want to find out how low the levels get.
The minimum level in the trough will tell you if you are taking enough to stop your body producing its own hormones. For estrogen takers it also will tell you if its enough to avoid menopause if you are taking a blocker.
The exception to this is testosterone injections that aren't Testosterone Undecanoate. This is because T can be a source of E and high levels of T will cause higher aromatisation to E. In this case it's also suggested to test at the mid point between doses. This allows you to see how much E is being produced from the T, and in general the T doses given are always enough to suppress regular hormone production.