ok i will. look into it but sadly i only have a laptop at the moment. (ascer aspire r7 572)You're on the right directions.
Just here another alternative to EMUNAND9tool: https://gbatemp.net/threads/release-3ds-multi-emunand-creator.381603/
That's PC app, so you run on PC which much preferable in case you have laptop and pc with you. Why it it preferable? Because if you run EMUNAN9tool and you misuse (not mishit since EMUNAND9Tool added extra step to make sure you can't easily mishit) an option, in most case, you waste 10, 15, 20 minutes (depended on the speed of SD card) and stuck there because you you can't abort it.
Beside back up NAND.bin (and EMUNAND.bin), always back up Nintendo 3ds folder before you proceed to make any changes to your 3DS.
but i becareful with this tool. also i backed up my emunand. i already have a nand backup as one of the video tut. i did said to make one