FACT: THERE ARE NO SUCH REQUIREMENTS. WPATH is an association of psychologists with no legal authority. HRT is a slow process and for anyone starting out their transition, there's plenty of time to change one's mind. It will become evident, quickly if HRT isn't right for you. The real problem is that many ask their primary care physicians for HRT and not having the experience, or education of the treatment of transsexual persons, they do a Medscape, or even Google search and find the WPATH. Find an expert on hormone replacement therapy--An endocrinologist.
FACT: The Endocrine Society asks that member physicians get a diagnosis from a mental health professional, however if the patient is insistent, or expresses the intention of buying hormones online, the endocrinologist may initiate HRT after disclosing the effects and consequences of HRT. While therapy is always a good idea, the so-called gatekeeper requirements are cruel, with many dishonest therapists charging exorbitant fees or requiring months of "treatment" for so-called HRT letters.
OPINION: I started HRT after a two hour meeting with an endocrinologist nine months ago. With respect to the real life experience, in this transsexual's opinion, it shouldn't be attempted until the person transitioning has been on HRT for at least 8 months. Not because you are required to, but because you WANT to. By the 7th month it's was difficult, if not impossible to continue presenting as male. Some of us may need more time, while others will need less. Despite its difficulties and the losses associated with coming out 9 months ago, I've never felt more hopeful and happy transitioning on HRT.