That simple? TWRP and then the custom ROM of choice? Which ROM do you recommend for daily usage which is fast and possibly based off Android 6 or 7?
Are you familiar with Odin? Is the s4 already rooted? (Towel root worked for me) and that is done ...
So far they are better than what I had searched for. Ty so much for answering and volunteering your time to help. I will be sure to pay it forward.
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One of these should put you on the right track: