You need to do a lot of reading and talk with some people before you tackle it yourself. You don't want to find out that you need to tear up your slab... That being said, you can do it if you take time to learn about the process and speak with some pros.
Here's a good place to start.
http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=hydronic+heat