I just had a first view on comet Holmes under medium circumstances (a bit of fog, and the moon low in the east) : the object is easily visible with the naked eye, and is very easily recognizable as a non-stellar object through plain binoculars : just aim at Perseus in the north.
There is very few detail to see in the comet; Holmes just looks like a giant snowball with a gray-greenish tint. Very large and beautiful object that will get better in the next few weeks, as the moon decreases in size and brightness.