i replaced 5400 rpm hdd with Samsung SSD 840 Pro
I did it Rober's way - thanks - no disconnecting antenna in step 10
Stopping after step 12 and replacing hard drive there without removing logic board
I put the sheet that was around the old hard drive over the new one - not sure if its needed?
After it is all done i did Command + R to do internet recovery and get OS X mountain lion on the blank drive
Last thing to do is go here to enable trim: http://www.groths.org/?page_id=322