There's no need. You'll get the update from Microsoft when it's ready for your device/carrier/region. This will install over the top of the developer preview and you won't lose any data/settings in the same way you would with a hard reset and using the Nokia tool.
if i do factory reset like power button volume button thing...is it good ? like hard reset.....after resetting it will i get preview for developer or it will get windows 8.0 and then it give me update itself ?
A hard reset will not affect the version of the operating system that you have on your phone. You can't get rid of preview for developer that way, neither can you regress back to Windows Phone 8.0.