I know exactly what you mean about being timid, but we found that if you pretend at first with the dremel, let them check it out ease them into it they get used to it really fast. cheese and treats also help. when we get one nail done they get treats. it also helps to not force it and when they try to pull away to let them and then go back to it and not hold them down. it takes some time doing like this but if you don't try to get all the nails done all in one sitting they seem to be okay with it the next time.
We have a cordless and use the lowest setting. Our older dog (terrier mix) used to hate the clippers but he has let us use the dremel on him and fell asleep the last time! definately a struggle saver!!!

good luck
amy