Some PC's mags sometimes give away a Live version that you can run from the disc, so you get to play with it before installing it on your PC. However there are a few Linux fans on the forum so i'm sure one of them can reply in more detail.
The Linux section here has many useful threads which give you the guidance that you need. Take a look around and you will get a lot of useful information which will be helpful to you to venture out and taste Linux.
If you have any specific questions after you are familiar with the guides you can always ask and we will oblige.