Leiloo,

The first thing to do is make up a "birthing" box for her out of a cardboard box lined with plastic and layered with old towels and rags. When you cut the box, make sure you cut an "edge" on it so that the mama can get out if she needs a break, but large enough so that the kittens won't fall out.

Make sure she has a clean litterbox, food and water and keep her in the back room. Do not let her out of the room or the house.

Pregnancy gestation for cats is 63 days. Since you say her nipples are large as well as her belly, she's probably due any day now.

When she starts getting antsy, not eating, that is usually a sign that she will probably go into labor within 24-48 hours. Just keep an eye on her once this starts happening. Unless one of the kittens or mama goes into distress during birth, it's best to just let her handle it. Cats have been giving birth for many years and nature has a way of taking care of them.

The kittens eyes will begin to open in about 3 weeks after they're born. Just continue to watch them and make sure mama is taking care of them and not ignoring any of them.

Good luck. If you need any more information, please feel free to post or PM me.