It's not like they can stop you from doing DIY HRT if you tell them, and they'll still be treating you for your stuff regardless of what drugs you'll be taking. They'll probably warn you that it is an increased risk (because it is kind of a risk) but if you're willing to take that risk, you could just do it. The only risk I do see is if you end up in the hospital for an extended period of time, it might be a difficult thing to have your HRT. But you can start up afterwards just fine.

I guarantee you're not the person taking the most risk in the hospital, but make sure you know how things will affect you. But in the end, if you think that now is the time to take HRT, now is the time. It's your body

Yeah I was just hoping maybe you could just tell your doctor you want the prescription and tests ordered and kind of self manage, or do that with planned parenthood. That's what I had to do with my current primary doctor since finding any with experience is rare since they're all full up on patients. I live I a fairly progressive area to the point that it's become a sanctuary for the whole country and it already had major doctor shortages. So this doctor is pretty new. Unfortunately, you'll fond regardless of where you go, you have to learn enough medicine to treat yourself most of the time. They just don't teach it in medical school and it's hard to find what little data there is of you're not explicitly looking for it and interested aa a doctor. I had a head start as I have worked in healthcare IT for many years and have done first aid and suturing and a few other classes because I wanted to be able to help people of needed and it's interesting to me. But I knew nothing about hormones, surgical techniques, vocal chords, and all the other stuff I've learned over the years.

And yeah definitely tell the oncologist, IMHO. HRT can definitely effect your metabolism and many other things that may or may not affect something as precise as cancer treatments which are basically barely nonlethal amounts of very lethal things, lol.

I did monotherapy (estradiol only) and avoided anti-androgens to reduce side effects, and I didnt want to do DIY. Mostly because I didn't start until later in life and I wanted to be a little more cautious and have more control and fewer side effects compared to someone younger who might be able to recover from issues more quickly.

My testosterone levels dropped on their own with just estrogen long before I had my bottom surgery. Doesn't work for everyone, but given your health concerns it may improve outcomes to at least start out that way. But again if doing DIY be sure to take care of what you're using and how much estrone or estriol you're getting from the less refined sources since most blood tests don't test for that and they can cause side effects including some evidence estrone being linked to breast cancer, though again those studies mostly done on women over 60.

Anyway, I hope it works out for you.