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/OctoCoinOr 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!
ALWAYS change rpcuser and rpcpassword unless you are 100% confident that access to the rpcport is blocked. Failing that, always encrypt your wallets. Otherwise, if the rpcport is accessible for an un-encrypted wallet and you download or copy/paste a .conf file with server=1 set or enabled by default then you can lose your coins. If somebody has access through the RPC port all they need is;
getaddressesbyaccount ""
dumpprivkey "oneofyouraddresses"
private key(s) can then be imported into another wallet and once there, funds can be transferred elsewhere, you just lost all your coins.
My bad! I always encrypt my wallets and only allow LAN IPs but still good points. No sense half-assing an important password. On most of my wallets I don't even have an rpcuser/pass since I never solomine.