So last time I asked How to do this Dirbaio said everything would mess-up if I did one thing wrong, but what Im wondering is more specific.

So now Im wondering:
*How to look in the existing code
*How do copy a sprite into another slot
*How to modify that copy

Any help is nice!

Learn programming and ASM hacking.

I can't explain how to do this from scratch if you have no idea about ASM and programming in general. I could write a step-by-step guide ONLY for this particular task, but it would suck, since it wouldn't be useful for other tasks.

Also "copying" sprites from one "slot" to another is not the way to go. Sprites are classes in the game's code. It's not simple data you can copypaste from here to there...

tl;dr: Go learn the basic stuff first