lmao, I'm afraid too... Don't wana have to reroot and customize everything again.
Nothing to be afraid of, only if you try and install the official released update to your rooted device, which will more than likely brick your phone.
Get MyBackup Pro, or Titianium backup Pro I use both. MyBackup for home screens, texts, bookmarks, etc and Titanium for my apps and their data. Just make sure you don't backup and restore any system data to the new rom.
Follow this to get the official update/rom for your rooted device: [ruu][rooted][MR1 aka OTA] CONFIRM Build Number: 1.13.605.7 Baseband: 1.16.00.0402w_1 - xda-developers
Better yet, flash Bamf 1.6.3 instead to get the new update, better battery life and an overall performance increase
