Thank you Terry! I don't trim whiskers either. Sugar will be showing in a couple of weeks, so it wasn't just a random thing, I would have had to trim it anyway! Usually, if they are not showing, I don't trim. Unless they get sooo bushy they stick out all over the place and Shadow's tail is the only one that gets that way.
All you really want is to define the shape. Just do a little at a time, then put the scissors and shears away and try again if you are not satisfied. BTW, I do groom dogs, but I'm one of those groomers that takes less off than more if possible. And I wouldn't take a B to a groomer for the tail. Most of them get the clippers out and shave it.