For a first time feed, sounds like it went alright since the mouse got eaten

You just gotta relax that reflex to jump and drop the mouse. I remember the first time I got bit by my corn snake when I got it when I was just a little kid, it was the first day I had it, the breeder my parents brought it from came to our house and brought an entire cage setup and the little hatchling. I had it in my hands as he was setting up the cage, and all of a sudden the little guy just decided to strike at my knuckle. It was SO FAST that I almost dropped the snake(so glad I didnt), and it was so freaking hard to fight the reflex to shake my hand to get him to stop.

First rule about interacting with a snake, be calm no matter what.

Like I said, for a first feed it went fine if your buddy got some food in him.