You've missed the boat I'm afraid - early spring (that doesn't mean April, and especially not the kind of April we're having right now) or late summer, so your next chance is end of August/September. I don't know what part of the country you live in, so can't be precise about when.

There is an excellent link on when to divide hostas on this link.
http://www.hostahosta.com/tips.html
You have asked your question twice so welcome to GOY and you can remove one of your questions if you like.