Just play around in it. See how long you can go without having to reboot and enter Windows. If you aren't sure how to do something, try to find out how on the web, even though it might have been faster just to reboot to windows, where you know how to do it. Basically, just force youself to use it and one day you'll suddenly realize you don't need Windows. On that day, rasie a flag and declare your independence from the tyranny.
