To get to a Factory reset using the Power up method:
1. Power Off phone
2. Press & Hold the HOME Button
3. Press and Hold the Power ON button.
You come up to the Triangle with the Exclamation mark & android guy.
Press BOTH the Up and Down Buttons at the same time. This brings up the Blue menu of options.
use the Up/Down arrows to scroll thru the choices. Press the POWER Button to Select the menu item you choose.
You can harmlessly test this and just choose to Reboot without doing anything, just to see how it works in case you ever need to do this in the future.