I haven't played it yet but at first glance it does pose some problems due to the gap between the 1st and the 6th level of PCs. If I'm not mistaken, the first encounter is the Locardo's Shemite riders. Just skip Locardo himself if your group's to weak for him. Besides, notice that the text doesn't read how many riders there are so you can limit their number to 2 if that would do.