Def get yourself on a course. It's not something you "poke with a stick" and see how you go. Check out all the info you can on the carpet section of this forum and learn as much as you can before you get the idea of going down to B&Q and renting a rug doctor

You wont believe how much can go wrong and how much that can cost to put right. All I'm saying is, get clue'ed up before you start soaking peoples carpets.

By the way Lee, carpets can earn silly money mate.