I use Aros (Icaros) on this laptop and on my netbook, it's quite easy to install. If you're starting with a blank hard drive, you boot from the Icaros Live DVD/CD and go into the Aros:Tools/ drawer and click on InstallAros. This wizard program lets you set up partition sizes, and then it will ask you to reboot. After you reboot, you should have one or two SFS partitions on your hard drive (depending on if you chose to have a Work: partition). You go back to Aros:Tools/InstallAros and go through the wizard again, this time it will find your new partitions and begin the installation process. Jump off and play with the cat for a couple of minutes, and when you come back you will have Aros installed on your PC, complete with hundreds of utilities, applications and games to try.
If you don't have a cat, maybe get a cup of tea or something. But you should still get a cat!