EOS (EOS) price, performance and general information

I've been wanting to change these keys for a long time but I'm scared of doing something wrong and being locked out of my EOS account.

I have a genisis account that has the same active + owner keys and I also created 5 other accounts which all have the same keys as the genisis. Ideally, I would like each account to have their own Active key and there own Owners key.

I have Scatter installed but its not the easiest tool to use. I'm also familiar with Bloks.io and eostoolkit.io and I know these tools allow me to change the keys but I need to know which should I change first, the active or owner and should I do the Genisis first or the connected accounts first. Also, are the new keys automatically generated or do I need a tool to produce a new set of keys?

I have asked this question before and I was directed to a YouTube video by Cyperglass but I didnt feel it answered or explained enough for me to feel confident.

I've heard that the easiest way is using CLEOS the Command Prompt/line tool but again I'm not familiar with using CLEOS as much as I would like to learn, I would need a step by step guide for 4 year olds with leaning difficulties to feel confident enough.

Any tips or advice would be massivly appriciated.