Backtrack, there are steps!
I already have b9s on my New 3ds.. Can I do this transfer without Problems?
You can, but you need to either have your other system hacked or be repaired to do a DSiware hack.
If both systems are hacked you need to do these steps to doing a complete system transfer
1: Backup the source system, including all of the saves, NAND, SD content.
2: Do a system transfer
3: Restore previous system
4: Dump the tickets from the previous system
5: Install tickets on new system with FBI. Some games won't install, most of the time it's games you legally bought
6: Go through system settings and delete games that failed to install
7: Dump saves of those games from previous system
8: Redownload all games that didn't transfer properly and restore previous saves.
9: Enjoy system! Play Ever Oasis!