OS X MIGRATION AND SSD REPLACEMENT
If my less than 30 days of experience on a MBA, and having migrated this system the first time without any assistance whatsoever, provides a bit of confidence with respect to simplicity, than so be it. I started this challenge with only the advice that Carbon Copy Cloner was free and would do the job perfectly along with the need for an external storage medium and pentolobe screwdriver.
The first step is to download and install Carbon Copy Cloner and ensure that your external drive is connected to the MBA. From there, you need to prepare your external storage medium so that it is compatible with Mac OS X. You then start Carbon Copy Cloner, choose your source (system drive) and destination disks (external drive) and hit ‘Clone’. Once complete, your system will automatically boot from the external source so you can switch off the original SSD with the new OWC Mercury Aura Pro.
This is where the pentalobe screwdriver comes in handy and it is the only one that will successfully remove the ten screws from the base of the MBA. Just as a heads up, only the 1.2mm pentalobe screwdriver will work and, once the back is off, a T5 Torx is needed to remove the stock SSD and replace it with the Aura Pro. A definite plus for OWC is that they include the proper pentalobe and torx screwdrivers with all 2012 Aura Pro SSD purchases.
Once the drives have been replaced, secure the base with cover and pentalobe screws, turn the system over, plug in the external drive and reboot. It will restart from the external and the next thing that appears would scare the heck out of you if this were a Windows system. Simply initialize the new drive.
We then need to format the new Aura Pro and clone the disk from the external to the Aura Pro. Go to Launch Pad/Utilities and select Disk Utility. Click on the OWC Aura Pro on the left and then select ‘1 Partition’ in the Volume Scheme, Format as ‘Mac OS Extended (Journaled), click ‘Options’ and select the GPT partition map and ‘Apply’. Last but not least, start Carbon Copy Cloner once again, choose your source disk (external), Destination Disk (Aura Pro) and select ‘Clone’. Remove the external and reboot. That’s it!
I sought out the simplest and most detailed article to assist and found it at ars technica.