you can ask an experience breeder to show you.. or ask your vet to show you the right way, is not dificult but it has to be done right in order not to harm the puppy.. I was very lucky that my mentor had a litter born days before my taffy was due.. but my son was teaching me the right way also, he made me practice and practice..and I really apreciate it now..but nothing like really watching someone with a puppy for you to apreciate the right way..
hopefully you will not have to use it but is better to be prepared.