Whenever you modify the NAND on a 3ds theres a small chance of a brick but its highly unlikely, ive used this method to downgrade 2 3dss now and nothing has gone wrong! and no its not much different then downgrading an o3ds... also the size of the sd card isnt a huge concern unless youre using something ridiculously small
Sweet, appreciate the responses =) Doing any of this through the data management over network going to cause any issues? I mean I have a microsd to SD reader but the network transferring is so much simpler