Before you install iOS 10, you absolutely should back-up your device to iTunes and then archive it. You can archive a backup by going into iTunes preferences -> selecting the Devices tab -> right clicking on your recent backup (of iOS 9.x.x) -> then choosing the ‘Archive’ option. This will ensure that the backup is not replaced when a newer backup occurs, and you’ll always be able to revert back to iOS 9. The same goes with Mac, wherein you make a full Time Machine backup on an external drive.
Ready to install iOS 10 or macOS Sierra? Head to https://beta.apple.com and sign up for the public beta using your Apple ID. The go back to https://beta.apple.com and Sign In. You can then head to the ‘Enrol your device’ tab and follow the procedure there. After installing the iOS 10 profile, you need to restart your device and then head to Settings -> General -> Software Update. For macOS, you need to redeem your AppStore code and then install macOS Sierra.
As for stability, I found iOS 10 as well as macOS Sierra betas to be surprisingly stable - very few app crashes and visible bugs. Your device will become significantly slow though, of obvious reasons. I don’t recommend you install iOS 10 or macOS Sierra betas on your main work devices because there may be bugs that you’ll experience that I haven’t.
Once you’ve installed iOS 10, make sure you check out my article: 100 features in iOS 10 you didn’t know existed (by EverythingApplePro).
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