I think that carbonara's quite hard, myself - getting the sauce to the right consistency.
To make carbonara, you cook some bacon, and cut the bacon up into little bits. Then you take two whole eggs, and two extra egg yolks, and put them into a bowl, and mix in 2 tablespoons of grated parmesan cheese. Then put in the bacon. Then stir in 4 tablespoons of cream. This is going to be your sauce.
Now you cook some spaghetti, and when it's cooked, you drain all the water out, and put the spaghetti back in the pan. Don't put the pan back on the hob - you don't need to. The pan's still hot, and the spaghetti's hot. Straight away, put the sauce onto the spaghetti and start stirring it till all the spaghetti is coated in sauce. The sauce cooks because the pasta and the pan is hot. It should take about 2-3 mins before the sauce is cooked. If you think it's not cooking, then give it about a minute on a low heat on the hob.
Parmesan is a sort of Italian hard cheese, and you can find it in the cheese section of supermarkets, either ready-grated or in solid blocks. It's quite expensive, so ironically you may find it cheaper to buy ready made carbonara.