Wanted to run this buy you all here first. I'm running Lion on my MBP. I have an external drive that I want to install Snow Leopard on so I can test it on another Mac. I'm thinking that I'm going to have to startup my MBP with the external drive and hold down C to run the install for Snow Leopard (making sure I select the external drive and NOT my internal MBP drive!). After the install, reboot and change my startup drive back to my internal. That's all I'd have to do, right? Just making sure. Thanks!