Let me put this very clearly. You don't need to go to an endo, any person with experience with HRT would probably do fine. There are GPs and OB/GYNs who have just as much experience with HRT. I have been seeing an OB/GYN for a pretty long time now, and he has extensive experience with HRT. In fact most of the experienced doctors in the area I live in are OB/GYN or GPs with regards to this issue. It doesn't take an endo to read a blood panel, just a somebody who has a DO or MD.
I should note this, there is an increasing number of OB/GYNs who are going into trans health care for HRT. Certian specialties tend to be more liberal, certian ones more conservative. Endos happen to be one of the more conservative specialties, OB/GYNs happen to be one of the more liberal ones. OB/GYNs are already trained how to do HRT, its part of thier speciality already. Just most trans people are so mindwashed with the "must go see an endo", they kind of ignore the other options.
Endos are the more expensive option, try to see if you can find a GP or OB/GYN who does it. Thier fees are much more reasonable.