It is common is some countries for people to make their own couscous. It is called "rolling couscous." This is a very difficult and tedious task and takes some skill (and lots of patience) to accomplish. Couscous is also manufactured, and readily available in supermarkets all over the world.
Most pre-packaged couscous is pre-steamed, meaning you just have to pour boiling water over it, sit, fluff, and serve. The goal is to have light and fluffy couscous, not a gummy texture. Many professionals feel that couscous should be steamed 2-3 times to gain the right texture.