Our local Sheriff offers the equivalent to the NRA First Steps intro to handguns course for free. Despite having my permit already, I took the course along with my wife, but I was hands-off during the shooting portion and stayed out of the instructor's way. My wife discovered two things that day - this really is fun and with her shoulder issues she really wanted a revolver. The next gun show she went and tried out every revolver there as well as a few smaller autos. She fell in love with the S&W J-frames and after a demo of a belly band decided on the "Hammer-less" model 442. I tried to warn her about it being an "expert's gun", but she is a stubborn woman who will not be told what to do. I figured that if she didn't like it I now had my BUG and we would go shopping again for her. Well, after several trips to the range she tells me how much she loves her "perfect little gun".
Now, don't take this as an endorsement for the small revolver as first-timer's gun. Gun selection is a personal choice, as we are all built a little different, and if you want to keep someone shooting, give them a gun they will want to shoot. But first, before they buy any gun, get them into a training class, at the very least a basic intro to gun handling and safety. Once they know how to shoot and what to look for, them take them shopping.