Everyone thinks their cat/kitten will do well or be good, but there is NO guarentee of showing any cat
The best you can do is to have had many people handle them and socialize them. But still, a cat that is not used to being in a show or around other cats can be unpredictible. In my experience, the males seem to be more mellow and easy going and take to shows better then females.
Hope things go well. I never go to a show expecting my cats to win (when showing a new cat). That way if they do win, you are pleasantly surprised and not disappointed if they don't do well.
Also you want your cat groomed THE BEST - clean coat, no tangles and eyes/ears cleaned and nails trimmed. Cat showing is top quality and if your cat is just so-so or not groomed well you won't win a thing!