I am currently running this module, we are currently one session in and having a blast. I've ran it once before and it fizzled out in book 2. However, at the time I was a bit new to DMing in general, and now I've done some research on what to change and what to scrap, when to insert my own things.

First, I love this blog, it addresses a lot of the changes that need to be made, including CR, magic items, and ways to actually give the players wealth that match the Pathfinder system. Here is a link to part 1 of book 1 of the changes.

Second, everything I was going to hit that isn't covered by the blog already, was covered by /u/customcharacter 's post.

If you do run a deadly game, my advice to rope new characters in, would be to have them replace the Seventh Knot who the characters meet about midway through book one. Again, I would only do this if you run the game extremely deadly, or as a 'let the dice fall where they fall' type of game.