Trimming hooves took us a couple of times before we got comfortable that we weren't going to make the sheep bleed all over.
Here is the information we used to get us started, we had never trimmed a hoof before we got the sheep. This will be a regular (read; quarterly) chore for the sheep. This step-by-step learning tool was borrowed from the www.infovets.com website.
* When learning how to trim feet, begin by removing small amounts of hoof wall at a time. Go slow and take the time necessary to let the foot down and check the balance of the foot. Removing small amounts and taking time to check balance on the foot will help reduce the chances of over-trimming and entering the sensitive structures of the foot.