Sounds like it's off to a good start. To get Willow comfortable with the idea, I put the trimmer in the floor for a few days so they could all sniff and play with it.

Then I turned it on (leaving it on the floor). They all ran away at first but came back to investigate. They figured it was a new toy and watched it buzzzzzz around the carpet.

Next day I tried it on Willow. No blood was shed but she only tolerated one pantaloon getting shaved. The next day I got the other one to even her out.