Ok so I did end up managing to install arm9loaderhax without a problem, and kept my NNID in the process (something which I was worried about). Now in the github tutorial I followed I noticed that there was a way to change the region to say...japanese or US. My question, now, is if I did that, how would I undo that? Like say for example I changed to japanese but didn't like that so I want to change back to EUR, would I just restore my previous nand backup? Sounds like a n00bish question I know, but this whole thing is kinda new to me and I don't want to break anything...