Preparing a kitten for the show ring is an endeavor that requires time, patience, and love. This begins with general conditioning that would apply to any kitten, whether it be a pet going to a new home, a breeder, or a show kitten. I am offering some suggestions, but I realize that this might not be practical for everyone depending on their cattery setup or their time schedule.
When my kittens are four weeks old, mom and the litter are moved into the living room. I have a holding cage where they can get used to the new surroundings, but as soon as they are comfortable. I let them have the run of the living room. There are usually a couple of older kittens and a couple of adult cats in the room also. My cats are pretty well socialized with each other, and the majority of them would have no problem getting along with the mother cat and litter.
Soon the kittens are old enough to discover climbing up into our laps. This may sound like I am stating the obvious, but I think that one reason my cats are so well socialized is that they spend an inordinate number of hours just sitting in our laps while we are watching TV or reading. When I pet them I also look at their ears, their feet, their throat, all part of what a person would need to do in the course of bringing up a kitten. I make it all very casual, no big deal to the kitten, and usually they just purr. This is the most important time of all getting them used to handling.