Overall hygiene is a given in any encounter - especially with a domina, and especially with a domina you have never met before. (One domina / escort I knew for a few years insisted that each client showered before a session in her bathroom. Eventually that is how our jungle Amazon role play began with her watching me strip and shower, and Her indicating where I should scrub.)

My usual preparation involved a call / email with the Mistress to review activities for the session and logistics a day or two before our meeting. (I no longer session in dungeons. For me they are too public so it is either Her apartment or a hotel.) I make my own outfit for each session and I do that the night before, reviewing in my mind how the encounter may go. I obstain from pleasuring myself for two or three days before session. All of this builds anticipation.

I try to pick a day to session where I have nothing to do the whole day or the very least nothing scheduled after the session. Usually after sessions I am physically and emotionally drained.

I try to dress in vanilla street clothes in an appropriate way that makes me feel sexy, usually mostly black. I wear my "jungleboy" outfit under my street clothes and bring underwear and some grooming supplies with me for after the session. (Rarely, on approval from a Mistress I knew, I didn't shave for a day or so, minimally showered and wore a scruffy t-shirt, shorts and sandals to augment the "jungle" aura.)

As I have matured I have learned that for the day or two prior to a session, especially in the hours before the appointment, that I get into sub space. It is far easier when you know the Mistress, but I do this on a first meeting too. I act like the Mistress has hired me to be her sub and, within limits, I will do anything to provide her with pleasure.

Finally, be a gentleman before, during and after sessions. Go the extra mile. In my experience, in most cases, if you are with the right Mistress She will see your effort and enjoy Herself, which means you will too.