I'm new to this but I had great success on my first try, and it was SO COOL!
What I did is I got a plastic container from the dollar store. It is about 16" by 12". I got my mouse in the early afternoon when Jub Jub was resting, and I put the mouse on newspaper in the plastic container for the whole day (cut small holes in the top for breathing).
That night when I usually see Jub Jub crawling around I killed my mouse in a plastic bag by slamming him against the bath tub. I got Jub Jub into the tub quickly, as I knew he would sense the scent of the mouse, and brought him into a pretty dark area of my bathroom, with just enough light for me to see what the hell I was doing (Next time I might close the door and have a red light) and took the dead mouse out and held it slightly above him in front of him about 6 inches or less, and it only took about 2 seconds of that. Bam! Then he ate. I let him consume the mouse and waited a couple of minutes then slowly brought him back to his home, and slowly rotated the plastic container so he would slither out and back to his hide place. That's what he did, and no throw up yet, so I call it a good one for me.