I have experience lots of OS upgrades from different devices before, so I am not new to the whole upgrade thing. Here are some things I take note in preparation to updating to a new OS based from my experience:
- If you wanna ensure a totally clean installation of your update. First do a factory reset; Second is to remove the SD Card; then install the update; after that reset your SD card too (back up first to a PC of course!); Then do a factory reset one last time. This will ensure a clean state before and after installing the update.
- Do take note the OS will be different so some of your third party apps may go rogue or cause battery drain (even if it has no problems before) because it may not be optimized to the OS you're in, in that case take note of which apps you're installing..
- If you're somehow scared to jump, then hold out and wait for a few days after reviews of the update come out
Hope this helps Thanks!