Well, there's no law to say you need a reason to see a therapist. So there's nothing to stop anyone seeing a therapist, beginning general therapy and then letting the whole gender dysphoria/incongruity issue emerge during treatment.
That is what happened with me. Actually, the thing I found difficult - over DECADES - was not that I had to live in role before getting therapy, but that successive therapists refused to believe me when I reported my own dysphoria ... had they done so, I might well have transitioned 30 years ago. As it is, I remain non-transitioned and trying to accept who I am and how I am in both respects: ie. that I have a dysphoric element (at the very least) to my personality, but I also, as a matter of practical fact, am able to function as a man and have dependents who relate to me as a son/brother/husband/father.
My point is we all go on our own journey and the job of a therapist, in any country, is to help each individual understand their own journey so that they can decide for themselves how they wish to take it.
Both my therapist and my doctor (who had 30 years experience in the field and would probably be known to some of the British women on here) came to the same conclusion. They both agreed that there was no psychological or physiological reason why I could not transition successfully and function as well as a woman as I had done as a man. They both were prepared to sign the letters authorising the medical treatment I would have to receive. The issue was entirely down to my desire or need to transition. For myself, as yet, that desire has not outweighed the other factors I have to consider. Others might have taken a very different decision.
For you, Zarania, as a much younger TS woman, the issues will be very different. The role of a therapist in this context should be very clear: to give you information about the nature of transsexuality and the process of transition and - more importantly - to help you determine precisely who you are and how you wish to proceed.
In that context it would be a huge mistake to pre-judge things by forcing you into Living In Role before you are completely ready. It's also worth adding that the advice I received from health professionals in the UK - and girls who'd been through transition - was to do the basics like removing facial hair and working on my voice BEFORE I even attempted to go full-time. As that Swiss link clearly states, there is a very close connection between passing successfully and transitioning successfully.
I cannot believe that any advanced western nation would have treatment protocols for gender dysphoria that ignored that established finding.