Rob,

There is no bad time to visit Ireland as long as you know what it will be like when you are there. November weather will be cool and may be rainy. Days are short so plan sightseeing accordingly. You don't want to be driving at night in Ireland unless you have to. Many things start closing at the end of October including B&Bs and sightseeing so plan carefully. Try to stay in larger towns or cities where there will be more going on, more lodgings to choose from, etc.

Michele