Upgrading Macbook Air hard drive and upgrading Snow Leopard to Mountain Lion at same time

I have a 2011 Macbook Air 3,2 running Snow Leopard (10.6.8). My 128GB SSD hard drive is completely full, and I have ordered an upgrade from OWC which also comes with an optional external enclosure. I would like to do a clean install (to "upgrade") to Mountain Lion on the new drive. Can anyone confirm if the following sequence will work?
1. Purchase Mountain Lion on App Store and download to an SD card
2. Connect my new OWC SSD as an external drive
3. Do a clean install of Mountain Lion from the SD card to my new external SSD
4. Boot from the external SSD
5. Use Migration Assistant to move everything from my in-system old SSD to the new (currently external) SSD
6. Shut down
7. Physically swap the SSD drives
8. Boot from the newly-installed larger internal SSD
9. Done?
Is it that simple or am I missing some major step? In particular, are there any complications with step 3 above?
Thanks for your help!

Carl,
The SD card can be used as a boot drive, if you manage to restore the image to the drive.. I tried to use an SD card in the built-in card reader, and for whatever reason could not get Disk Utility to restore the InstallESD.dmg image to the SD card directly when done throught the Air's reader. I had to use an SD card that had a built-in USB tab, and use USB. I did not try using an external SD adapter to the USB port to see if that would work.
Remember, you don't open the package by double clicking the installer, you Right-click (or Control+click) the installer, and choose Show Package Contents from the resulting contextual menu. In the folder that appears, open Contents, then open Shared Support; you’ll see a disk-image file called InstallESD.dmg.
Launch Disk Utility (in /Applications/Utilities). Drag the InstallESD.dmg disk image into Disk Utility’s left-hand sidebar to the flash drive you want to restore the image to.
I would copy the downloaded installer to a safe location, so if you ever need it again.

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Upgrading Macbook Air hard drive and upgrading Snow Leopard to Mountain Lion at same time

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