I'm a guy but perhaps some stuff may be of use.
Regarding sex. I did a little bit of planning to make sure I was gonna be comfortable. I started by getting a rough idea of the size of his knot and practiced a little with toys until I was comfortable with that. If you aren't ready as a guy it can hurt quite a bit!
When it came time to do the deed I had already prepared a bit (clean, lube) and got into a good position for him. Luckily for me he got the idea pretty quick and mounted me. He was quite fast and rough, but I enjoyed it, knot slid in part way while he was fucking me which hurt a little at first but took me to cloud 9.
It was one of the most powerful emotional and sexual things I have experienced. For over 15 years I tried to deny being a zoo, but even when I was busy shouting from the rooftops about how I most definitely wasn't a zoo there wasn't a nanosecond that went past where I had any regrets or would have changed a thing about my experiences.
Obviously you are a different person and this won't necessarily be how it works for you. From the time I started thinking about doing it, till after the first time was over and the next, my mind never had a single regret and my attractions never wavered, emotions only grew. I think before the first time I knew in my heart that this was something I really wanted. I was very committed to the idea by the time I came around to doing it.
If you are unsure on those kinds of grounds I feel like it is good to get to a place where you are fairly certain what you want.
Hope this helps <3