xdaforums.com/showthread.php?t=2689821
you need root, busybox, cwm
INSTRUCTIONS: FROM THE POST I LINKED
Fresh Install (recommended)
1. Have JB latest Stock Kernel, Roger's Baseband in case of LT28i, Root and Recovery
2. Format System/Data/Cache in TWRP or Mount and Format the same in CWM
3. Install the ROM and Reboot. Nothing else is needed
If you are already on CM-10 by Mr.Gezz, you might be able to restore your Data partition. In this case, after
initial installation steps above:
1. Reboot, let the rom settle, then restart the phone and go to TWRP
2. Restore your previously backed up CM-10 rom: DATA ONLY!!! The only thing you might have different is if you had a different SU app, you now might have two. In this case, delete the one you are not going to use. Although, this method should work fine, the preferred way is always: Fresh Install