I was seeing a general therapist hoping that he would help me to start this path, but all he did was trying to discourage and scare me, and explore "nurture" related stuff.
Then I did a bit of DIY, transferried into Informed consent, met another general therapist (she used to be my GP and had some experience with LGB folks), but there was little added value. Then I signed in for appointment with another therapist who had experience with transfolks, but I only needed an answer to very specific question which she could not provide me. She was good but I did not feel the need for regular sessions. So, in the end, I can attest that therapy is not necessary unless You feel like You need it and have extra cash for it.
We have a local board of psychiatrists who assign the F64.0 diagnosis, but I did not bother to see them because it might have an adverse effect on my record, besides the only use for their opinion is if I intend to have the SRS in the local clinic (which is still private so I have to pay out of my pocket) - which is not my intention anyway, and most notable foreign surgeons would require letters from well-known therapists anyway.