ABS/ESC Control Module removal precautions (Coding)

Hello everyone. Im seeking some precautionary advice before i take on the job of fixing my ABS control module on my 2009 petrol 200bhp mk2 Octavia vrs, pre facelift. Engine code CCZ.

Im in research mode currently, and so far i have established a company who can refurbish my original unit for around £190.00, or i have found a used unit for £152.00 with a matching P/N 1KO614517BD. The company i have found is called BBA Reman, their based in Rochester in Kent. Oh and the used part btw is off a 2011 mk2 with same engine code ect ect. Im not doing main dealer for obvious reasons (plus thats another long story and hassel ive had).

  Really what im after is coding info.

If i was to have my original unit refurbed, will it need recoding to the car when i refit? Seeing as its original to the car im hoping i should be ok. And same with the used part, its was paired to a different car so seems quite likely to me it will need coding/pairing upon fitting? 

Now if i take the route of using the original, which its looking like i am first, is there any precautionary measures i can do before removal so as i don't lose some important information such as codes thus making my life difficult. Maybe i can grab the codes and stop a stressfull refit. I have a friend who can do the coding for me and has the tools for the job, tho he will need to gen up a bit from his support team. Hes deals more with BMW's and Mercedes but more than capable.

Any help and advice appriciated.