Made this video just to show how EASY it really is to switch to a larger memory card on your 3DS (and 2DS.) Surprisingly, Nintendo didn't make you have to jump through a bunch of hoops to do this like they are known for doing with other transfer processes.

NOTE: In this video I copied my data from one card to the other directly, since I used a USB card reader and my built in card reader. IF YOU ONLY HAVE ONE READER, simply copy the data to a temporary folder on your computer, then pop the new card in place of the old one then copy the data to it that way. It really is very simple.

Any questions, feel free to ask and I will do my best to help you.