My tip is regarding iPhone iOS updates. If you do this all your updates will be painless and work. First clean all your clutter, remove all internet history an if you have the time delete all your deleted emails. Then back up your phone to iCloud and then change your settings and connect your phone to your computer and back up there too. You now have two backups in case anything does go amiss. Finally, power down, count to 10 and power back up. Make sure your phone is on charge and take the upgrade. Don't touch it until it is finished. I do mine when I go to bed! Try it, it works. One more thing, make sure you have 1.5 times more space than the update's size!
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