This video will show you how to use Custom Firmware Enabler on your PSP. This tutorial starts off assuming that you already have intalled ChickHEN. Once this has been done, you can follow this tutorial and get CFW installed onto your PSP 3000.
That's it! Once you've completed this, you've successfully hacked your PSP. Make sure you do not turn your PSP off (set it on standby instead) or you will have to perform these instructions again.