Originally Posted by jmppe3
Nothing will overwrite other than the recovery, of course.
Read what I said above. Look, if you are going down this road please don't be so worried. Noting is going to be 100% for certain. It will most likely be fine, but just take precautions. Make a backup to an SD card. Copy it to your computer. There - if it somehow gets wiped, you have a backup on your computer. Worst case scenario - you buy a new phone. Pain in the ass, sure, but not the end of the world.
It looks from the thread that you have been pondering this for months. You need to just do some reading on whatever you're unsure about and go for it. If you're still uncomfortable trying it, then stay where you are.