Several viable implementations of XSL are available that you are free to download and experiment with. There are also industrial strength products that support the recommendation. If you need a robust, reliable, full implementation to support your business, you will have to pay for it. You will also find versions to freely experiment with as proof of concept or to improve your skills.
At this point, you might like to download the Antenna House evaluation copy used by the author, one of the free implementations or an evaluation copy of another commercial implementation and begin experimenting with the simple example in the next chapter, "Hello XSL World."