1. Chase sheep around a pen until you're sweaty and tired and they're just getting warmed up.
2. Grab a sheep by its jaw. This will stop the sheep from going forward.
3. Put your leg behind the sheep's butt. This will stop the sheep from going backward and might also leave a nice rorschach smear on your pant leg.
4. Flip the sheep onto its butt, like a judo twist.
5. The sheep will sit quietly between your knees, and will mostly allow you to examine it.