Plailect's Guide is fantastic. 3DS hacking noob here. Over the last week, I successfully modded 6 3DSes (2x n3ds 4x o3ds) using Plailec'ts instructions. Depending on the firmware version, I used browserhax or OoTHax as the entry point. The best bet is to print the guide, read each step twice, and cross 'em off the list as you complete them. I had once incident where the an o3DS bricked, during the downgrade to 9.2. However, I was able to boot up in safe mode, let it update to 10.7, and then tried the process again. Once I got the hang of it, it only took about 4 hours per console.
Sound quite good to be honest. However I do not have OoT so I have to rely on the browserhax. and if I understood the guide alright this will work on SysNAND 9.2
I have 4.4 so I would simply have to update to 9.2 with help of the guide and hope it works. I will try this out this weekend and cross all my fingers