I have been asked to share some tips on learning to trim a corgis nails. I hope what I share will be helpful to some.
First may I say that the sooner you begin this process the better. Please practice handling your pups feet from day one. I like to start with a small cordless dremmel. This is less powerful and makes less noise that the corded ones. If you have a helper this makes it so much easier. I do not generally have a helper so I do it on my own.
I generally bring a handful of small treats. I prepare my area and make sure I have all the tools I need for the groom session. I usually use the bathroom as it is small and I can keep my pup confined. I generally enter and give a few treats. I turn on the dremmel and let the pup investigate and become a bit comfortable with noise. Depending on the pup I may then hold the dremmel in my hand and let the feel the vibration on their body (while my hand is wrapped around the dremmel) I give litte treats so they realize this must be a pretty good thing.
I then lay them across my lap, head to my left (because I am right handed) and pet them to comfort and relax them. I may give them another treat or two. I then turn on the dremmel and start grinding. I do little bits at a time. Remember the friction will cause heat so do not push hard or leave it on the nail for long. Keep going until you can get a little off each front nail. This will likely be enough for the first session.
Some pups will be much more receptive then others. Those that have been raised in a home environment and been handled frequently will fair much better. One needs to know their specific pup and work at his level.
I think one of the biggest problems with nails is the tension the people feel while attempting it. If you are tense and/or nervous your dog will feel it. Try to be calm, relaxed and confident when doing nails.
If you have a helper I suggest they sit in a chair with the pup in their lap. I generally sit on the floor which puts me at a good level to work with the nails. Have your helper pet, talk to and treat the pup frequently. I also seem to notice that the dogs that can not see what is happen do not react as much.
Another little trick is getting a jar of peanut butter just for the dog. Let them work at licking the peanut butter out of the jar as you trim. Some dogs totally ignore the dremmel when this is the method used.
I personally do not use the clippers often. My dogs seem to be more reactive to those then the dremmel. More room for error with these as well. If you do choose to use clippers have "blood stop" or another product on hand should you "quick" your pup. Thankfully many corgis have white nails so the quick line is easily seen. Be most careful to clip too far. This is quite painful to the dog and I think often the reason many dogs are so bad about having their feet done.
The newest dremmel out now is the Pedicure. The design is great as the actual rotor is covered and can not drop and get caught in the dogs hair. I have not used it and do not know how strong it is.
Most of all trim frequently and make it as pleasant of an experience as you can. Plan ahead, have all of your tools ready and have plenty of little morsels.