Jeffman

So I decided I need to replace one of my rear wheel bearings. I was told that I would have to replace the entire rear hub since I wouldn't be able to get just the bearings. Is this true? Also, is it very difficult to replace the rear hub or is it pretty easy. They guy only wanted $100 labor to put it in, so I have to think it's not too bad, but I'm usually wrong. lol.