In stock form this will get you to the recovery that allows you to wipe your user data. If you have an alternative recovery installed, ClockWorkMod as an example, this will get you booted into it.
UPDATED - we don't need to hold the VOL+ button.
1. Power Off the Device
2. Hold N and Power
3. After the screen has been on for about 5 seconds, release the buttons.
I hope this helps!