Thankfully, we don't have to warn you not to accidentally update to the current firmware version, since we already have a jailbreak of iOS 8.1.2!
TaiG has released a jailbreak utility for iOS 8.1.2 that works on Windows. We are still waiting for a Mac OS X version; however, since a beta of iOS 8.2 has already been seeded and iOS 8.1.3 has already been spotted, we suggest you update to iOS 8.1.2 and jailbreak as soon as possible.
You can find instructions on how to jailbreak your device using the iClarified Jailbreak Wizard.
Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.