I have loaded a save game, though I found that at the level I took most encounters were wimpy so I chugged invisibility after invisibility and let me henchie fight, while I run to the end. Again, meh, finished the game, but it was not worth that much.
While finding troll caves were not a problem I got stuck after killing warwick. If you decide to play make notes where doors say they require a key! It's similar to never-openable door text, so look out for them! This module not only deserves a walkthrough, but balancing for one range of levels!
HINT SPOILERS: go to large house in forest that you could not unlock previously.