Indeed, I would go the USB method if I were you, you can download a small program called 'unetbootin' that will burn an ISO file to USB for you and make it bootable, nice fast way of doing it.
Good to note that a few USB flash drives are inexplicably incompatible. I have a couple of PNY 4, 8 and 16GB jobbies which do not want to be bootable, no matter how they are formatted or which tool used. My Kingston, Sandisk and a different PNY work fine though. Mystery to me