I'm not OP, but I agree with the latter.
Go in expecting to need to learn some stuff, and you'll probably need to learn less than you expect. Set aside a couple hours for the setup process, you probably won't need it, but you might. Figure out where to go for help before you start. Leave yourself a backup plan in case you don't finish.
Linux is pretty easy to use these days, but it's a new thing and will take getting used to. Expect the worst and be pleasantly surprised when things work out.