Not Complicated at all. Once you have the update zip...
**make sure you have your battery charged before doing this**
1. Move the zip to the root (not in any folders) of your sd-ext (not internal sd)
2. Shut the phone down
3. Hold the X button on your keyboard while powering up the phone
4. Once you're in the bootloader screen (android and !) press and hold the up vol and while holding, press the down vol
5. Navigate to Install update and select with the power button
6. Navigate to the zip file and chose it with the power button
7. Wait
8. Keep waiting
9. Once it's done you should see the option to boot into android at the top, do that.
The initial boot up took a little longer than usual, but that's it.