It’s a style of training. Give it a go and see if you like it. Try all the alternatives e.g. Percentage based training if you haven’t already. Then you can use what works for you.
Personally I don’t use RPE because I’m too ill disciplined to do anything less than an RPE 8. Probably a remnant of my bodybuilding days with sets to failure than assisted “all you bro” reps.
You’ve no idea what you’re doing including how to go about modifying programs to better suit you. Until such time as you have a clue: Nah mane.
If it works well for you the first time why not run the cycle again and adjust starting weights up a bit.
Sticking points for raw lifting don’t really change over time. You can have various weaknesses which can be addressed or just forever worked at but unless you go equipped your sticking points are staying put. You just need to get better at generating more bar speed to plough through them.
Lot of it is semantics but for more info on assistance exercises refer to Elitefts’ article "The Powerlifters Guide to Assistance Exercises & Training"
If you can’t answer this you’re not ready.
To conclude: get read up. Ima point you in the right direction cuz you should learn this shit sooner or later. Don’t watch all at once because you’ll be overwhelmed by info: