My guess is that if hes jumpy around sounds is that shaving his feet is a big job, I would suggest goin to a groomers and letting the scissor them for you, Is his feet knotty? is stuff gets caught in them it can make them smell but there was a post a few months ago about the smell of dogs feet ( Crazy people here ) It's so easy to slice a dog with a trimmer if the dog isnt willing to stand up for you and if the dog is squirming about its makes it so much harder and scissoring should really be done only if you have 100% confidence in yourself and the dog you are working with which to be honest I dont think you do, I was the same a few years ago! I really dont mean that in a bad way but maybe it should be left to the "Nasty groomers" to do the feet instead of you because he trusts you and you dont want to mess that up with an accident.