I encourage it if you know how to read guidesDon't take risks, like I did. When you get it working finally, the payoff is very, very joyous.
My setup was arguably the worst; I started dumping the nands, and used the .bat file to unbrick the 2.1 emunand. I was leaving my house, so I moved my NAND dumps to my phone. On the way there, I restored my nand and thankfully someone had wifi, and I got my OTP and backed it up around four times. I toyed around with 2.1 for a while, it's kinda cool.
My phone's file manager is extremely unreliable. Then I did the exploit to get the OTP, and then used another to load Decrypt9 on 2.1. I restored emunand first. While it was backing up, I saw that it said "Restoring SysNAND" and I was worried since I had to close the system (sleep mode, which is why I restored emunand first). Sure enough, when it closed, the screen went black, and I thought I bricked it. After about 20 minutes of actually watching the basketball game, I decided to remove the battery. My emunand WAS successfully restored, and I guess nothing in the sysnand was touched. Later on, I restored my sysnand and everything was fine. Except for losing my games and saves in Pokemon RGBY and Smash (specifically), everything's fine now.
Do not attempt this without focus and about 3-4 hours of free time!