@Naomithea I can tell you what happened at my clinic.
The first time I went, I saw a psychologist. Basically they went through my history, any medical issues I have, then they wanted me to talk about when I first had feelings that I was different, and what they were, and when. My experiences as a full time trans woman ( you don’t have to be full time when you first go. ) They will access your mental state, that is are you able to understand, and cope with the reality and consequences of transition. Their intention is to ensure that you are doing this for the right reasons, and are fully committed to it.
The sooner you can go full time and change you name, and everything that has to go with a name change, the easier it will be for you to make them feel that your are committed, and able to live in your chosen gender role, without any significant issues, for the rest of your life.
They will then see you several times, after that, with long waits in between. The next person I saw was I psychiatrist, and it was that same clinician that I have seen each time after the first appointment. They will go over and over with the same questions, asked in different way. Asking in a different way is what they do to get you to recall things which you may have left out in previous appointments.
There is nothing to worry about, just be honest and open about your feelings, and recollections from your past. Go with the flow, let them ask you what they want to know, but also, offer up anything that they don’t ask about, which you feel may be relevant; or any questions you may have. They may shut you down on somethings, which they may have in mind for another time, or feel are not something they need to know. They have a set time to talk with you each time, and so may want to save those things for when they have time to go into them in more detail with you at a latter date.
The second opinion has to be by a different clinician, one which you have not had any contact with before.
You need 2 years living in role to be referred for surgery, and proof that you are fully socialised. Which is, a job, volunteering, or attending some kind of social group, where someone can write a letter to say you have been attending in role for at least a year, but preferably 2 years.
ETA. My clinic has a nurse and a peer support worker, who see me in between Dr appointments. The peer support worker saw me well before my first clinic appointment; but I was OK without her help, we only spoke a few times. You have to see the nurse when they send an appointment though.
I have just got the clinics approval to be referred for surgery. Yay !