Yes, protecting the radiator is a must if you try to do the job without removing the radiator. If you don't have some kind of protection, you may wind up removing the radiator to install a new one. It's really easy to damage it.
But even a rookie can do this job. Just take it slow and easy, and take pictures along the way so you know how it came apart. That's so you know how to put it back together!
Pro-tip: Sour cream or cottage cheese containers are great for holding nuts & bolts while you're working. Don't just lay them anywhere, or you'll will be sorry you did. It's really hard to see them, but they DO have legs!
But, uh, keep the wife happy. Use EMPTY ones. She's probably not going to like it much if you use the half-full one in the refrigerator. Especially if you put it back when you're done!
IF you decide to remove the radiator, take a very close look at those hoses. If they are iffy, this might be a good opportunity to replace them. New hoses are a lot cheaper than an overheated engine.