Hello fellow Apple-geeks. I've received my Yosemite BETA mail today (I'm not a developer) and since I only have one Mac computer, I thought of ways I could test it out without putting my primary machine at risk in regards to major bugs and unpleasantness. In my search, I stumbled upon a very easy and fast guide on how to install OS X Yosemite unto an external drive. I thought I'd share it here with you guys because it may help a few people out. It's fairly straightforward and something even an average user should be able to follow. Now my albeit small wall of text will stop. Click this link to check the guide out for yourself. Hope it helps. Cheers.