Before downloading and installing the update, there are a few housekeeping items you might want to take care of first.
Download the latest version of iTunes 10.7 -- This will add iOS 6 compatibility to your software
Back up your photos and important files. Even if you use iCloud, consider doing a full backup in iTunes, just in case.
If you don't already have a copy of your contacts and calendars on your Mac or PC, go ahead and back those up too.
Apple tends to do fairly well with OTA updates but problems can happen. If you don't need to have iOS 6 right this second, waiting a few hours for the update isn't a bad idea.Are you able to download iOS 6? Let us know how your upgrade is progressing! More Info,http://news.yahoo.com/ios-6-now-heres-first-130242471.html