Please take it easy, she will pick up on your stress. I am sure she should know what to do, please have a safe area for her and nesting bed or box for her to have the kittens, a large cardboard box lined with fleece or old tshirts will work nicely. Please don't use towels, the little claws will stick. Do not overly check, obsess over her as it will stress her and may cause her to hold off on delivering them. It helps to keep the room dark too. checking in once or twice an hour should be fine. Please keep us posted on them.
Many of these links have been readied by our forumist Red Top Rescue:
We have a good collection of articles in the Cat Health section which you can access by scrolling up to the brown bar, clicking on Articles,and then choosing the Cat Health section and scrolling through the choices. To make this super easy for you, I am copying the links regarding birth, delivery and newborns for you here. After reading this information, let us know if you have any more questions. And good luck with your approaching new arrivals.