[Q] Rooting and CWM my 2nd n7000

Hi guys
I recently brought a 2nd hand n7000
This rom is totally stock, to be precise, it is a Hong Kong version 4.0.4

Since I want to improve the battery life and have a more defined rom.
I would like to root and install CWM.

Up to now, I understand that there's the infamous brick kernels out there. And I probably need to stay away from ICS.
But because of my n7000 is 2nd hand, i don't know much history about it.
i can not know for sure, that this n7000 is shipped with GB or ICS at the first place?
Or the last guy actually upgrade it from a GB.

My research in this forum tells me it's always better to start with the JB aka 4.1.2 stock.
My question is can i simply flash a HK 4.1.2 as a base without doing all sort of EMMC checking?
Then, flash kernel comes with root & CWM? And finally my rom of choice?

I would like someone could guide me and show me the SAFE way,

Thx in advance!!