Can i go back to cm11s this way?

Hi! My question is lame, i know.. But here it goes anyway, i couldn't find a simple and direct answer..
Is less than a week that i have this phone, and i've been reading a lot of guides of how to rollback to cm11s.. the thing is i've flashed the latest CM12S signed zip ota through CM Recovery, everything is fine as i'm testing it right now..
My question is: if i want to go back to CM11S (in the case that i don't like CM12S or have some bugs), can i just wipe data / factory reset and cache in CM Recovery, and then flash the cm11s signed zip?
I haven't rooted or unlocked bootloader, is it relatively easy from what i read around here.. but i wondered if i had to go through all those steps (unlock bootloader, custom recovery, and then flash) or just doing the steps mentioned before will work just fine..
Is it better to fastboot flash or through custom recovery is fine also?

Thanks in advance!

PD: I'm also asking what do you think about some other 5.1.1 Lollipop ROM, custom kernel, etc.. I'm kind of a flashaholic and i would be able to install the custom recovery if would be really worth it :D
PD2: sorry for the bad english, i'm from argentina