Oh my, I'm so sorry to hear of your difficulties.
Let's start to parse this for you... try keep up now:
First thing:
Back Up
See that? The bit in bold and underlined. Two vital words. Obviously you missed them, or perhaps you didn't understand them. Let me reassure you that if you do that step no matter what the outcome, you can return to the status quo ante to the state preceding - which means there is no risk. Is that hard to grasp? Do I need to explain more?
Second thing:
Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one.
Just to make it easier for someone with your special difficulties, I've again underlined the key passages, and made them bold too.
Obviously you have basic comprehension difficulties and I hope this has clarified things for you.
Please proceed with caution when doling out your thoughts.
Solid advice, my friend, try follow it sometime. it is indeed better to remain silent and be thought a fool and so forth...