If you're new to Apple development and have never had to install a beta version of iOS, we'll walk you through how to get started with iOS 6 beta from start to finish. You can do this with either xCode or iTunes.
Disclaimer: While we can't stop you from installing a beta version of iOS, we strongly encourage the general public to stay away from betas. Unless you need access to the beta as a developer or an app tester, you should wait for the official version. Betas are typically buggy, apps crash, and things don't always work the way they should. That's why it's called a beta. iMore assumes no responsibility for any issues or data loss that could occur from installing a beta on your iPhone, iPad, or iPod touch.
Before installing any beta software you'll need to make sure the UDID for each device you plan on using beta software on is on file with Apple in order for them to validate the install. You can do this directly through the Developer Portal.
If you're an app tester, this step will probably be done by the app developer. They will probably ask you for your UDID if they don't already have it on file.
You can now start installing beta versions of iOS on all the devices you've provisioned.
You're now ready to start installing betas on your devices. To do this, you'll need to use the newest version of iTunes which is 10.6.3 or you can do this through the xCode 4.5 developer preview. I recommend that developers use the xCode method while app testers are probably okay using the iTunes method unless the developer would prefer you to use xCode to submit feedback.
This time around there is no beta version of iTunes needed. Just make sure you're running the current version of iTunes which is 10.6.3. You can download it from Apple's website.
Either update method will get you onto the beta. It's up to you to decide what method is most appropriate for your situation.