Yes, existing tutorials will still be available if you follow the
upgrade instructions. The directions strongly encourage backing up your database, too, if something does go awry. But GotS is designed to retain data on upgrade.
Re: frame blocking, if you already have pop-up mode enabled, that's all GotS can do currently. We've been discussing some ideas for improving that, but it's not a exactly a bug... browsers are rightly enacting more security around frames.
If you have some control over your site, you could prevent it from sending the HTTP header and value "X-Frame-Options: SAMEORIGIN".
No problem at all... those are good questions!
Mike