Not to be a buzzkill but you also have to remember its still in beta and thereforee contains bugs. I wouldn't put it on your main phone. Developers are more prepared to deal with bugs and know how to resolve issues that arise. I am personally a chicken s%#t that would rather wait the 2 more months for a stable supported version.
There are a few members on the board willing to register UDIDs, check the other threads. Maybe you can find a link to iOS7 Beta 1 which doesn't require a registered UDID, and then OTA update to 3(might work)? As for not installing it on you daily driver, I will say there are some less than desirable bugs, I CAN NOT say they've effected my daily driver in any serious manner. Since you don't seem to know how to get it, I wouldn't advise getting it, there's a reason it's not available to everyone at the moment.