If you feel you need to see a therapist you should see one, but you won't get HRT from them. Its not what they do.
If you can see an endocrinologist who does trans medicine that can be better, as they are more skilled than a GP or nurse. They might detect health problems that the others wouldn't, so less risk.
Personally I like to check what I'm being prescribed myself, and make sure its all what its supposed to be. I don't really trust doctors much.