No you don't but as I always suggest, once you do a factory data reset (best done where you can connect via WiFi), right after you sign back into your google account, SET THE PHONE down and just leave it alone. It'll have the little circle 'sync' icon in the notification bar for a bit, but once that dissapears, STILL LEAVE your phone alone, i.e. do NOT touch it until you get the message in your notification bar that says, "xxx Applications Restored", 'xxx' being how ever many google restored.
Sorry for the 'SHOUTS', it's just my way of emphisizing.
good luck