After death, given that there are no options, there is automatically no divine guidance. The lack of divine guidance is replaced by the soul's own knowledge. The only duty the gods of the underworld has is to rule over it, nothing more. The rest of the job is done by their minions. In both epics, the role that the dead and the gods are, as told before, the main factors that guides characters during the epic.
Gods are the main guides in real life, the dead takes the role in the afterlife.
However, there are also other elements that also guides people which can be considered between both worlds. The most obvious ones are the ghosts, the apperances of dead people in real life. A ghost image reflects someone who is dead but trying to warn or simply a living person. As it is seen in the Aeneid, the appearance of Aenas' father is a good example. The ghost appears for a short time and then leaves, telling Aeneas to come find him in the underworld.