Just to do it right.

I just have to download the new wallet and add the nodes, that's all?

Far from a newb when it comes to mining and technology in general but I've never done a conf file. I thought I did it right but get a run time error. Care to lend a hand?
If you are on Windows you just open notepad and toss this in there off OctoCoin post 1:
listen=1
server=1
daemon=1
rpcuser=user
rpcpassword=xxx
rpcport=22888
addnode=162.243.144.135
addnode=162.243.149.125
addnode=162.243.207.204
addnode=162.243.141.242
You don't even need the usr/pass but whatever - defaults are fine. Then you save the file as OctoCoin.conf in /Users/(your username)/AppData/Roaming/OctoCoin
Or if you chose a different folder when you ran Octo for the first time you can save it in there. If you don't see AppData in Windows Explorer you might have to go to View >> Options >> Change Folder and Search Options >> View >> Show hidden files and system files and save. If you are on Linux I think you go to /home/(your username)/.octocoin and toss it in there.
Sounds more complicated than it is if you've never done a conf - should be no prob. Then close the client and re-open. Odds are you won't even need to add the nodes actually but the devs are probably just playing it safe. I did it just in case!