Yep it really is that easy, takes 2 mins if the other person knows what they are doing, and can type - slightly longer otherwise. The router won't let you online until you reset the SSID and passphrase, not idea why it pops up with the login box afterwards - you certainly don't need to log in - the username is virgin and the password is password for anyone who is curious and wants to have a look at the config page, which can be accessed at any time via IP 192.168.0.1 or
www.routerlogin.net or
www.routerlogin.com the www. is not actually required.