Requeening shouldn't be that hard, if there is no queen in there, hopefully there isn't. They should be ready to accept a queen if they've been queenless for this long. I wonder how old the bees are that are in the hive, if they've been without a queen for a while. Hopefully they'll live long enough to nurse the brood, that would be my concern.
Like tank said, I'll let someone with more experience chime in.