1. Follow imnuts instructions for preparing for OTA found here http://rootzwiki.com/topic/10202-how...or-the-gb-ota/
2. place file on root of SD card and rename to update.zip
3. boot to stock recovery and select apply update.zip from sd card
It takes a while to complete, so be patient. Make sure you have plenty of battery.
ps. No one is responsible for what you do to your phone except you. This has been tested by at least a dozen people in IRC and works flawlessly when you follow the directions.
pss. this build is 4 days newer than "EP4P" regardless of what the numbering scheme may be.