Everything you need is described in detail here: http://osx.portraitofakite.com/
Download the Package. There is only one installation file you need.
The installation is very easy.
- You can choose what to to. Optional create a restore point.
- What features you what to need.
During the installation, It will change different files from your XP system.
Here, I select all options, so this will change my XP in a Mac OS/X Look&Feel as much as possible. - Also the login screen will be changed.
NOTE: It will need less then 300MB!