Question: I bought a 240 GB SSD to replace the 500 GB primary HDD in my new MacBook Pro.

How do I clone the current Lion system image on my 500 GB HDD to the SSD? I want to clone the entire drive not just copy data.

I can only have either the HDD or SSD in the MacBook Pro at a time. I have an external 500 GB USB drive that can I use if necessary. I've seen suggestions on using Carbon Copy Cloner but I'm not sure how to proceed with only one disk in the MacBook Pro at a time.

Answer: 
Use [Carbon Copy Cloner (CCC)](http://www.bombich.com/), I have used it in the past, it's great and free!
There is support on the website and tutorial videos.
I had an issue going from a large drive to a smaller SSD, even after deleting files. I found out it was because of the Lion MobileBackup volume. I turned off this feature and let it clear the files, then restarted, then I was able to make the move.