dd won't work in your case. dd is just a byte-by-byte copy utility, and you're talking about copying the entire filesystem with it. You'd end up copying a filesystem that's the exact same size to your new larger hard drive, wasting the additional space. And you'd have nowhere to put the filesystem from the other hard drive. In reality, there are ways to solve this problem, but they require very advanced knowledge of Linux.

Just follow the instructions that Tony pointed you to. They're as easy as it's going to get.