swapping out internal hard drive

[andys_mf]

I'm fairly new to all this and am about to upgrade my drive - but i've got a question - as I don't currently have an external drive - what are my options for backing up. I'm planning on using the existing drive as an external back up once the change is done, and have bought a hard drive enclosure for it.

Would it be possible to use this to set up the new drive first? Not sure i'm explaining this very well.

What i'm thinking is put the new drive in the enclosure and connect via usb, use disk utility to format the new drive to guid? and then use super duper to create a bootable back up on this disk?
would i be right in thinking, that if i did that, when i put the new drive in the macbook it will just start right up as if nothing had changed?

hope that all makes sense!