How to downgrade from CM11 to CM10.2

[Theziggy]

Hi

I flashed CM11 on my rooted Samsung S3 LTE which was running stock 3.5. I am thinking of going down to CM10.2. (I hear it isn't as tough on the battery)

Do I just wipe cache and dalvik, factory reset, flash Rom and Gapps, wipe cache and dalvik and reboot or is it more complex.

Thanks in advance

Z